LSP: Implement Phase 4 Endpoints

[0101]

Name	Type	Direction	Category	Priority / Dev phase	Supported by FSAC	Note
textDocument/willSave	Notification	➡️	Document synchronization	4
textDocument/willSaveWaitUntil	Request	↩️	Document synchronization	4
codeAction/resolve	Request	↩️	Language features	4
codeLens/resolve	Request	↩️	Language features	4	✅
inlayHint/resolve	Request	↩️	Language features	4
textDocument/codeAction	Request	↩️	Language features	4	✅
textDocument/codeLens	Request	↩️	Language features	4	✅
textDocument/prepareRename	Request	↩️	Language features	4
textDocument/publishDiagnostics	Notification	⬅️	Language features	4	✅
workspace/codeLens/refresh	Request	↪️	Language Features	4	✅
window/showMessage	Notification	⬅️	Window Features	4	✅
workspace/configuration	Request	↪️	Workspace Features	4
workspace/diagnostic	Request	↩️	Workspace Features	4
workspace/didChangeConfiguration	Notification	➡️	Workspace Features	4	✅
workspace/symbol	Request	↩️	Workspace Features	4	✅
workspaceSymbol/resolve	Request	↩️	Workspace Features	4