Adding ability to share connection strings through connection sharing API.

[aasimkhan30]

Pull Request Template – vscode-mssql

Description

This in response to #20261 (comment)

The user needs a connection string in order to run some sqlpackage command through their extension.

This API checks if the user has granted permissions to share connection with the external extension and then shares the connection string for the connection id.

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (npm run test)
• Code follows contributing guidelines
• Telemetry/logging updated if relevant
• No regressions or UX breakage

Reviewers: Please read our reviewer guidelines

[github-actions]

PR Changes

Category	Target Branch	PR Branch	Difference
Code Coverage	55.72%	55.53%	⚪ 0.00%
VSIX Size	4857 KB	4852 KB	⚪ -5 KB ( 0% )
Webview Bundle Size	4008 KB	4008 KB	⚪ 0 KB ( 0% )

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.65%. Comparing base (2c77db9) to head (cae9366).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/connectionSharing/connectionSharingService.ts	0.00%	14 Missing ⚠️
src/extension.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20300      +/-   ##
==========================================
- Coverage   53.70%   53.65%   -0.05%     
==========================================
  Files         198      198              
  Lines       17267    17283      +16     
  Branches     1156     1157       +1     
==========================================
  Hits         9273     9273              
- Misses       7994     8010      +16     

Files with missing lines	Coverage Δ
src/extension.ts	21.17% <0.00%> (-0.52%)	⬇️
src/connectionSharing/connectionSharingService.ts	7.69% <0.00%> (-0.47%)	⬇️

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