Remove/split `rust-analyzer` from `rust`

[baszalmstra]

As a follow-up to #267 , the rust package also contains rust-analyzer. Unpacked its 37MB (~4%) of the total size of the package. Regardless, I dont think it should be included because for regular compilation it's not required at all.

Furthermore, rust-analyzer gets more frequent updates outside the rust release cadence so I think this should just live in its own package.

Id be happy to make a PR if this is desirable.

[pkgw]

This seems reasonable to me, thanks!

[baszalmstra]

See #271

[ruben-arts]

For future reference, on a windows machine the installation using rattler the installation looks like this:

❯ hyperfine --shell nu -p "rm -rf .prefix" './target/release/rattler create "rust 1.92.*"' -p "rm -rf .prefix" './target/release/rattler create "rust 1.93.*"'
Benchmark 1: ./target/release/rattler create "rust 1.92.*"
  Time (mean ± σ):     19.309 s ±  6.920 s    [User: 3.109 s, System: 22.967 s]
  Range (min … max):    9.195 s … 34.033 s    10 runs

Benchmark 2: ./target/release/rattler create "rust 1.93.*"
  Time (mean ± σ):     942.3 ms ± 962.1 ms    [User: 273.4 ms, System: 224.7 ms]
  Range (min … max):   235.2 ms … 3479.8 ms    10 runs

Summary
  ./target/release/rattler create "rust 1.93.*" ran
   20.49 ± 22.17 times faster than ./target/release/rattler create "rust 1.92.*"

[srbhp]

It would be great if we could pull rust-analyzer as a separate package.