Feature: Update kiota vs code extension

[ElinorW]

Fixes #4293
Fixes #4719

User Story 1

• Add new API Explorer container + my workspace container
• Add/Modify/Update existing 'add', 'filter', 'generate', 'open file' icons
• Modify 'add API' function to support searching or pasting a url to open a API description on open API explorer and update dialog
• Add/Modify/Update existing icons on tree items
• Add delete confirmation dialog
• Add dialog to enable generating a client, plugin, or API manifest
• Modify steps to generate each

[thewahome]

I love that this work has initiated work to break functions down into manageable code files

[sonarcloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)
4.1% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[andrueastman]

Looks good from my end.
Thanks for pushing this through @ElinorW

[baywet]

Great work! Thanks for the long haul on this one.
When you merge, please squash (arrow next to the merge button) as there's a lot of history here.

[sebastienlevert]

WE MADE IT! 🎉🎉🎉🎉🎉🎉