internal: Include toml files in the vfs

[lnicola]

Closes #15753

[lnicola]

r? @Veykril do you think it's worth trying to limit this to clippy.toml and rust-analyzer.toml? I hope nobody has 200 MB TOMLs lying around...

[Veykril]

I think it'd be fine to just include rust-analyzer.toml, Cargo.toml and clippy.toml (and . prefixed variants as well I guess? for clippy and r-a)

[Veykril]

Assuming we can do that easily, I don't remember how this stuff works. Otherwise this seems fine to me as well

[lnicola]

IIRC I looked into it and it didn't seem trivial. It even took me a lot of time to figure out how we load .rs files.

I think Cargo.toml and Cargo.lock are loaded with the workspace, while the code here filters by extension.

[Veykril]

Does not surprise me, then let's keep it this way for now
@bors r+

[bors]

📌 Commit bad3d9e has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit bad3d9e with merge 8bfe0aa...

[bors]

☀️ Test successful - checks-actions
Approved by: Veykril
Pushing 8bfe0aa to master...