Merge #10384

10384: Add vscode native onEnterRules r=matklad,lnicola a=HKalbasi

This PR copy onEnterRules configurations [from vscode-rust](https://github.com/rust-lang/vscode-rust/blob/master/src/extension.ts#L287) based on discussion in #6254

I understand that the ideal way is to use parser data for this, and probably all other things that language-config do. But since it can't be enabled (or at least it isn't enabled) by default in vscode, I think this is needed (until onEnter becomes official LSP and get vscode support).

People can still configure shortcut and use the parser based onEnter, so it wouldn't harm anyone.

Co-authored-by: hamidreza kalbasi <hamidrezakalbasi@protonmail.com>