Provide a Ballerina command to display the API specifications of all active LS APIs

[nipunayf]

Purpose

This PR adds a new hidden Ballerina command that displays API specifications for all active Language Server APIs. The command can be accessed using bal language-server-spec

Fixes #43635

Samples

Screen.Recording.2024-11-21.at.11.46.32.PM.mov

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Attention: Patch coverage is 71.22302% with 40 lines in your changes missing coverage. Please review.

Project coverage is 77.45%. Comparing base (ba7c74d) to head (fb02274).
Report is 49 commits behind head on master.

Files with missing lines	Patch %	Lines
...erinalang/langserver/apispec/ApiSpecGenerator.java	72.82%	13 Missing and 12 partials ⚠️
...allerinalang/langserver/cmd/LangServerSpecCmd.java	38.88%	11 Missing ⚠️
...ballerinalang/langserver/launchers/stdio/Main.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #43641      +/-   ##
============================================
- Coverage     77.48%   77.45%   -0.03%     
- Complexity    58519    58551      +32     
============================================
  Files          3434     3439       +5     
  Lines        218713   218837     +124     
  Branches      28918    28942      +24     
============================================
+ Hits         169467   169511      +44     
- Misses        39850    39919      +69     
- Partials       9396     9407      +11     

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