704: Feat/jinstall lsp r=matklad a=DJMcNab
Add `cargo jinstall-lsp` as a shorthand to include jemalloc support
Also activate the extension when the commands are run which is makes sense to activate.
I still need to work out what `Run` actually does to give it a better name, and other extensions through some voodoo magic are able to hide their commands from the command palette before the extension is activated, which would be a better fix.
705: Pass Documentation up to LSP and add "rust" to our codeblocks there r=matklad a=kjeremy
Fixes#699
Co-authored-by: DJMcNab <36049421+djmcnab@users.noreply.github.com>
Co-authored-by: Jeremy Kolb <kjeremy@gmail.com>
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