fix(config): Change config option to snake_case in file and SCREAMING_CASE in code

[niheaven]

Description

Use snake_case in ~/.config/scoop.json and CREAMING_CASE in Scoop code for config options.

Also change some config options' name:

• lastupdate -> last_update
• 7ZIPEXTRACT_USE_EXTERNAL -> use_external_7zip
• MSIEXTRACT_USE_LESSMSI -> use_lessmsi
• NO_JUNCTIONS -> no_junction
• manifest_review -> show_manifest
• rootPath -> root_path
• globalPath -> global_path
• cachePath -> cache_path

Motivation and Context

• Relates to Naming convention for setting names in ~/.config/scoop.json #5098

How Has This Been Tested?

NOTICE If someone want to test this PR, please backup ~/.config/scoop.json 😄

Local tests (.\bin\test.ps1) passed, and scoop config gives a warning if use old names. (BTW, PowerShell is case insensitive)

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.