Merge #322

Merge #322

322: Fix analyzer extension fail when there are enabled any VIM extension r=matklad a=max-frai

`type` command is allowed only once to be registered and it was built specially for vim mode.
So if user has vim extension enabled, rust-analyzer initialization failes on trying to register own `type` handler.

Unfortunatelly, there are no nice ways to check if command is already registered so the way is to wrap everything with try/catch and notify user about conflict.

Co-authored-by: frai <me@maxfrai.com>