lister: Add new rust crates lister

The Crates lister retrieves crates package for Rust lang.

It basically fetches https://github.com/rust-lang/crates.io-index.git
to a temp directory and then walks through each file to get the
crate's info.

.pre-commit-config.yaml

@@ -17,6 +17,7 @@ repos:
       - id: codespell
         name: Check source code spelling
         exclude: ^(swh/lister/.*/tests/data/.*)$
+        args: [-L crate]
         stages: [commit]
       - id: codespell
         name: Check commit message spelling