feat(lsp): LSP 3.18

[fannheyward]

• inlineCompletion
• SnippetTextEdit

Closes #5071

[codecov]

Codecov Report

Attention: Patch coverage is 72.00000% with 42 lines in your changes missing coverage. Please review.

Project coverage is 97.21%. Comparing base (dce5ae5) to head (a41662e).

Files with missing lines	Patch %	Lines
src/language-client/client.ts	67.74%	19 Missing and 11 partials ⚠️
src/provider/inlineCompletionItemManager.ts	33.33%	8 Missing ⚠️
src/core/funcs.ts	0.00%	0 Missing and 2 partials ⚠️
src/language-client/index.ts	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5126      +/-   ##
==========================================
- Coverage   97.37%   97.21%   -0.17%     
==========================================
  Files         291      293       +2     
  Lines       27026    27105      +79     
  Branches     5606     5630      +24     
==========================================
+ Hits        26316    26349      +33     
- Misses        496      525      +29     
- Partials      214      231      +17     

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[creasty]

With https://github.blog/changelog/2025-02-10-copilot-language-server-sdk-is-now-available/, I need 3.18 more than ever!