feat: client-side for module hierarchy (#620)

This PR adds client-side support for a new module hierarchy component in
VS Code that can be used to navigate both the import tree of a module
and the imported-by tree of a module. Specifically, it adds a new module
hierarchy tree view and 'Module Hierarchy: Show Module Hierarchy' and
'Module Hierarchy: Show Inverse Module Hierarchy' commands to display it
for the current file. Companion PR at
[leanprover/lean4#8654](leanprover/lean4#8654).


![Imports](https://github.com/user-attachments/assets/74e052e9-cf1a-443e-b429-239c34a61d11)
![Imported
by](https://github.com/user-attachments/assets/fe223337-06b3-474a-bf94-2421fccc1dfd)

This PR also changes all commands of the extension to exclude the
`Category:` prefix from menus.

Author: mhuisi

README.md

@@ -10,7 +10,7 @@ After installing this extension, a 'Welcome' page with a setup guide should open
 - Setting up a Lean 4 project
 - Troubleshooting issues
 
-If the setup guide does not open automatically, you can still open it manually by opening an empty file, clicking on the ∀-symbol in the top right and selecting 'Documentation…' > 'Docs: Show Setup Guide'.
+If the setup guide does not open automatically, you can still open it manually by opening an empty file, clicking on the ∀-symbol in the top right and selecting 'Documentation…' > 'Show Setup Guide'.
 
   ![Setup guide with instructions for how to re-open the setup guide manually](https://github.com/leanprover/vscode-lean4/raw/HEAD/vscode-lean4/images/setup_guide.png)
 

vscode-lean4/README.md

@@ -10,7 +10,7 @@ After installing this extension, a 'Welcome' page with a setup guide should open
 - Setting up a Lean 4 project
 - Troubleshooting issues
 
-If the setup guide does not open automatically, you can still open it manually by opening an empty file, clicking on the ∀-symbol in the top right and selecting 'Documentation…' > 'Docs: Show Setup Guide'.
+If the setup guide does not open automatically, you can still open it manually by opening an empty file, clicking on the ∀-symbol in the top right and selecting 'Documentation…' > 'Show Setup Guide'.
 
   ![Setup guide with instructions for how to re-open the setup guide manually](https://github.com/leanprover/vscode-lean4/raw/HEAD/vscode-lean4/images/setup_guide.png)
 

vscode-lean4/manual/images/command-menu.png

@@ -7,7 +7,7 @@ If you encounter this issue, you can try disabling your antivirus, re-run the co
 
 ## Collecting VS Code Output
 If you are encountering an issue with Lean or this VS Code extension, copying the output from the 'Troubleshooting: Show Setup Information' and 'Troubleshooting: Show Output' commands can be helpful for others who are trying to help you. 
-You can run these commands by clicking on the ∀-symbol in the top right and selecting 'Troubleshooting: Show Setup Information' and 'Troubleshooting: Show Output'.
+You can run these commands by clicking on the ∀-symbol in the top right and selecting 'Show Setup Information' and 'Show Output'.
 
   ![Troubleshooting](troubleshooting.png)
 

vscode-lean4/media/guide-help.md

@@ -1,6 +1,6 @@
 ## Creating a Project
 Below, you will find links that create new projects or download projects for you. After creating or downloading a project, you can re-open the project in the future by clicking the ∀-symbol in the top right, choosing 'Open Project…' > 'Open Local Project…' and selecting the project you created. If possible, you should avoid creating projects on network drives or in directories indexed by cloud storage, e.g. OneDrive.
-Completing the project creation process and choosing to open the new project will close this guide. You can re-open it later by clicking the ∀-symbol in the top right and selecting 'Documentation…' > 'Docs: Show Setup Guide'.
+Completing the project creation process and choosing to open the new project will close this guide. You can re-open it later by clicking the ∀-symbol in the top right and selecting 'Documentation…' > 'Show Setup Guide'.
 
   ![∀-symbol buttons](open-local-project_show-setup_buttons.png)
 
@@ -10,7 +10,7 @@ If you want to create a new project, click on one of the following:
   Dependencies can be added by modifying 'lakefile.lean' in the newly created project as described [here](https://github.com/leanprover/lean4/blob/master/src/lake/README.md#adding-dependencies). You may want to add [Lean's standard library](https://github.com/leanprover/std4) to the list of dependencies.
 - [Create a new project using Mathlib](command:lean4.project.createMathlibProject)  
   The created project will depend on [Mathlib](https://github.com/leanprover-community/mathlib4), the math library of Lean 4. This option is suitable if you want to use Lean 4 for a math formalization project.  
-  To update Mathlib after creating the project, you can click the ∀-symbol in the top right and choose 'Project Actions…' > 'Project: Update Dependency…'.
+  To update Mathlib after creating the project, you can click the ∀-symbol in the top right and choose 'Project Actions…' > 'Update Dependency…'.
 
 If you want to open an existing project, click on one of the following:
 - [Download an existing project](command:lean4.project.clone)  

vscode-lean4/media/guide-setupProject.md

@@ -26,6 +26,7 @@ import { displayInternalErrorsIn } from './utils/internalErrors'
 import { registerLeanCommandRunner } from './utils/leanCmdRunner'
 import { lean, registerLeanEditorProvider } from './utils/leanEditorProvider'
 import { LeanInstaller } from './utils/leanInstaller'
+import { ModuleTreeViewProvider } from './utils/moduleTreeViewProvider'
 import {
     displayActiveStickyNotification,
     displayModalNotification,
@@ -207,6 +208,8 @@ async function activateLean4Features(
         clientProvider,
     )
 
+    context.subscriptions.push(await ModuleTreeViewProvider.init(clientProvider))
+
     await setLeanFeatureSetActive(true)
 
     return { clientProvider, infoProvider, projectOperationProvider }