Merge deps of related crates in Rust Analyzer support

[hlopko]

It can happen a single source file is present in multiple crates - there can
be a rust_library with a lib.rs file, and a rust_test for the test
module in that file. Tests can declare more dependencies than what library
had. Therefore we had to collect all RustAnalyzerInfos for a given crate
and take deps from all of them.

There's one exception - if the dependency is the same crate name as the
the crate being processed, we don't add it as a dependency to itself. This is
common and expected - rust_test.crate pointing to the rust_library.

[UebelAndre]

Nice one! A couple of small things but otherwise looks good 😄

[hlopko]

Related: #704

Github is confused. Requested changes were addressed.