VS Code: Add recommended extensions in extensions.json

[dan-hughes]

Pull Request (PR) description

Add recommended extensions to extensions.json

This Pull Request (PR) fixes the following issues

• Fixes #622

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [ ] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98%. Comparing base (bdde66f) to head (9935d37).

Additional details and impacted files

[](https://app.codecov.io/gh/dsccommunity/ActiveDirectoryDsc/pull/708?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dsccommunity) ```diff @@ Coverage Diff @@ ## main #708 +/- ## =================================== Coverage 98% 98% =================================== Files 25 25 Lines 3475 3475 =================================== Hits 3406 3406 Misses 69 69 ```