[LLVM][UTILS][VSCODE] Add LLVM LSP support in LLVM VS Code extension#170489

Bertik23 wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

Bertik23:vscode-extension-upstreamingBertik23/llvm-project:vscode-extension-upstreamingCopy head branch name to clipboard