Add command to restart language service

[sheridanchris]

WHAT

🤖 Generated by Copilot at 8a851bf

This pull request adds a new feature to the extension that allows users to restart the F# language service from the command palette or a keyboard shortcut. It defines a new command fsharp.restartLanguageService and registers it in the release/package.json, src/Core/LanguageService.fs, and src/fsharp.fs files.

🤖 Generated by Copilot at 8a851bf

If your F# extension is slow
And you want to give it a go
Use fsharp.restartLanguageService
With a key or a palette, your choice
And it will reload the language flow

🔄🌐🔧

This will close #1911

WHY

Ionide frequently has corner cases and needs refresh, I think it would improve to some extend developer experience just to have a way to completely restart ionide from vscode, when nothing else works, instead of closing and reopening vscode.

#1911

HOW

🤖 Generated by Copilot at 8a851bf

• Add a new command to restart the language service (link, link, link, link)

• Define the command "fsharp.restartLanguageService" in package.json with the title "Restart Language Service" and the category "F#" (link)
• Assign a keybinding to the command when the editor language is F# in package.json (link)
• Implement the command logic in LanguageService.fs by defining a "restart" function that stops and starts the language service using a promise (link)
• Register the "restart" function as a command handler and subscribe it to the extension context's disposable resources in LanguageService.fs (link)
• Activate the language service feature when the extension is activated by calling "tryActivate" with the feature name "languageservice" and the activation function LanguageService.activate in fsharp.fs (link)

[sheridanchris]

This seems to work for a multi-project solution but I'll have to test it more to make sure there aren't any oddities. I could invoke the fsharp.clearCache command but I'm not sure how useful that is, feedback is required.

[TheAngryByrd]

Thanks for this!. Seems to work fine with latest changes.