Add a registry for GitHostingProviders (#11470)

This PR adds a registry for `GitHostingProvider`s.

The intent here is to help decouple these provider-specific concerns
from the lower-level `git` crate.

Similar to languages, the Git hosting providers live in the new
`git_hosting_providers` crate.

This work also lays the foundation for if we wanted to allow defining a
`GitHostingProvider` from within an extension. This could be useful if
we wanted to extend the support to work with self-hosted Git providers
(like GitHub Enterprise).

I also took the opportunity to move some of the provider-specific code
out of the `util` crate, since it had leaked into there.

Release Notes:

- N/A

crates/git_hosting_providers/src/providers.rs

@@ -0,0 +1,13 @@
+mod bitbucket;
+mod codeberg;
+mod gitee;
+mod github;
+mod gitlab;
+mod sourcehut;
+
+pub use bitbucket::*;
+pub use codeberg::*;
+pub use gitee::*;
+pub use github::*;
+pub use gitlab::*;
+pub use sourcehut::*;