LSP: Implement Phase 3 Endpoints

[0101]

Name	Type	Direction	Category	Priority / Dev phase	Supported by FSAC	Note
fsharp/compilerLocation	Request	↩️	F# Custom	3	✅
fsharp/documentAnalyzed	Notification	⬅️	F# Custom	3	✅
fsharp/documentation	Request	↩️	F# Custom	3	✅
fsharp/documentationGenerator	Request	↩️	F# Custom	3	✅
fsharp/documentationSymbol	Request	↩️	F# Custom	3	✅
fsharp/dotnetaddproject	Request	↩️	F# Custom	3	✅
fsharp/dotnetaddsln	Request	↩️	F# Custom	3	✅
fsharp/dotnetnewlist	Request	↩️	F# Custom	3	✅
fsharp/dotnetnewrun	Request	↩️	F# Custom	3	✅
fsharp/dotnetremoveproject	Request	↩️	F# Custom	3	✅
fsharp/fileParsed	Notification	⬅️	F# Custom	3	✅
fsharp/lineLens	Request	↩️	F# Custom	3	✅
fsharp/notifyCancel	Notification	⬅️	F# Custom	3	✅
fsharp/notifyWorkspace	Notification	⬅️	F# Custom	3	✅
fsharp/notifyWorkspacePeek	Notification	⬅️	F# Custom	3	✅
fsharp/pipelineHint	Request	↩️	F# Custom	3	✅
fsharp/project	Request	↩️	F# Custom	3	✅
fsharp/signature	Request	↩️	F# Custom	3	✅
fsharp/signatureData	Request	↩️	F# Custom	3	✅
fsharp/testDetected	Notification	⬅️	F# Custom	3	✅
fsharp/workspaceLoad	Request	↩️	F# Custom	3	✅
fsharp/workspacePeek	Request	↩️	F# Custom	3	✅
fsproj/addExistingFile	Request	↩️	F# Custom	3	✅
fsproj/addFile	Request	↩️	F# Custom	3	✅
fsproj/addFileAbove	Request	↩️	F# Custom	3	✅
fsproj/addFileBelow	Request	↩️	F# Custom	3	✅
fsproj/moveFileDown	Request	↩️	F# Custom	3	✅
fsproj/moveFileUp	Request	↩️	F# Custom	3	✅
fsproj/removeFile	Request	↩️	F# Custom	3	✅
textDocument/documentHighlight	Request	↩️	Language features	3	✅
textDocument/documentSymbol	Request	↩️	Language features	3	✅
textDocument/formatting	Request	↩️	Language features	3	✅
textDocument/rename	Request	↩️	Language features	3	✅
textDocument/signatureHelp	Request	↩️	Language features	3	✅
$/progress	Notification	⬅️	Window Features	3	✅	Would be nice to have for long running operations
workspace/didChangeWatchedFiles	Notification	➡️	Workspace Features	3	✅