WIP: feat(cpp-client,csharp/client,py/client,py/client-ticking): DH-20077: Github workflows for building C++, Py Static, Py ticking, C# on Windows

[kosak]

This GitHub workflow is designed to build the following clients on Windows:

• C++
• Python Static
• Python Ticking
• C#

It is WIP because:

1. We need to agree on the overall approach
2. It's possible GH_PACKAGES_USERNAME is wrong and needs to forced to be a specific user
3. If we want to do code and NuGet package signing for C#, we need to add CODE_SIGNING_CERT_PFX_BASE64 as a repository secret. This is discussed here: https://docs.google.com/document/d/1NifmHCYkqXSTwz732JpTyGMEJhpxbkgK_IMNSD7-MlA/edit?usp=sharing
4. We need to make sure it actually works. (It works for my repo; will it work in deephaven/deephaven-core?)

The other problem is build times:

1. A cold build (unpopulated NuPkg cache) is 60-90 minutes
2. A lukewarm build (NuPkg cache but no C++ cache) is 10 minutes
3. A hot build (all caches present) is < 2 minutes

Developers who fork this repository may be paying for steps 1 and 2 more than they would like to.

[github-actions]

Pull Request titles must follow the Conventional Commits specification.
Breaking changes that are expected to impact users must include "BREAKING CHANGE: " at the end of the PR description.

Details:

Unknown release type "WIP" found in pull request title "WIP: feat(cpp-client,csharp/client,py/client,py/client-ticking): DH-20077: Github workflows for building C++, Py Static, Py ticking, C# on Windows". 

Available types:
 - feat: A new feature
 - fix: A bug fix
 - docs: Documentation only changes
 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
 - perf: A code change that improves performance
 - test: Adding missing tests or correcting existing tests
 - build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
 - ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
 - chore: Other changes that don't modify src or test files
 - revert: Reverts a previous commit

[github-actions]

No docs changes detected for 27883ce