repo.ancestry returns PyAsyncGenerator now

[dcherian]

We should have a more user-friendly sync API, maybe the latest 10 commits.

[paraseba]

It returns a weird object that can be used both as a sync or async iterator.

[dcherian]

Yes list(repo.ancestry()) works, but since we already have a complex object, having the repr return the latest 10 snapshots may be a good option.

We could also make it a more complex object that represents the ancestry that allows operations like:

anc = repo.ancestry()
anc.show(from=..., to=...)
anc.latest(n=10)

So take inspiration from git log

[ianhi]

This broke the final example in https://icechunk.io/en/latest/icechunk-python/quickstart/#explore-version-history which using indexing to access the history