Support getting stats for a specific commit in MergeRequest GraphQL query

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Right now there's no way to select a specific commit on a MergeRequest query and get its stats similar to diffStatsSummary.

This is required to fix Number of changes in MR changes when scrolling ... (#483020 - closed).

I see two possible approaches to fix this:

Option A

1. Allow passing a commitId to the MergeRequest query.

This approach is similar to how our REST API works but doesn't align well with GraphQL's resource structure.

Option B

1. Add a commit field to MergeRequest query (commits won't work as it's pagination based)
2. Add a commitId argument for Commit query
3. Provide commit stats field in the same shape as diffStatsSummary

This option aligns better with GraphQL's paradigm but requires more effort to implement.