feat: support SourceControlInputBox extension api

[pipiiiiii]

Types

• 🎉 New Features

Background or solution

ISSUE: #3227

Changelog

[codecov]

Codecov Report

Attention: Patch coverage is 5.00000% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 57.31%. Comparing base (e750e96) to head (ad6180f).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...es/extension/src/hosted/api/vscode/ext.host.scm.ts	0.00%	20 Missing ⚠️
...xtension/src/browser/vscode/api/main.thread.scm.ts	0.00%	12 Missing and 1 partial ⚠️
packages/scm/src/common/scm.service.ts	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3409      +/-   ##
==========================================
- Coverage   57.34%   57.31%   -0.03%     
==========================================
  Files        1433     1433              
  Lines       88301    88340      +39     
  Branches    18192    18204      +12     
==========================================
+ Hits        50633    50635       +2     
- Misses      34272    34308      +36     
- Partials     3396     3397       +1     

Flag	Coverage Δ
jsdom	52.55% <5.00%> (-0.03%)	⬇️
node	16.03% <5.00%> (-0.01%)	⬇️

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