Leverage LSP to do compile instead of CLI

[chunyu3]

Fix #6663

Now we are having many problems when triggering the compile from CLI and handling its output in our Output window like multiple loglevel, how to handle ```stderr``, coloring and so on.

So to resolve all these problems, let's trigger compile through LSP instead of CLI so that we can retrieve the result of compile directly which is more reliable and also easier to do post-processing.

[github-actions]

All changed packages have been documented.

• ✅ @typespec/compiler
• ✅ typespec-vscode

Show changes

typespec-vscode - feature ✏️

Use language server to compile project instead of CLI

@typespec/compiler - feature ✏️

[LSP] Expose new compile project command

[azure-sdk]

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

[chunyu3]

/azp run

[azure-pipelines]

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