Add a config to not check rev deps

[alibektas]

I can confirm that it was not the case before, editing/save in that deep crate was immediate when rust-analyzer.check.workspace was false. Now, it seems like true or false value is meaningless because you're just checking all the dependent crates. And it has really degraded my developer experience using RustRover RustAnalyzer: each save takes about 5-10 seconds... Before I was invoking cargo check for the whole workspace on demand. I think, it would be good to have the option with these values instead of just true and false: "all", "dependent_crates", "current_crate"

Update: RustRover was a typo here, I meant RustAnalyzer.

Originally posted by @afroozeh in #18141