feat: Add update_lance and delete_from_lance APIs

[Lucas61000]

Is your feature request related to a problem?

The Lance library natively supports dataset.update() and dataset.delete(), but daft-lance currently does not expose wrappers for these operations. Users who store data in Lance format through Daft have no way to update or delete rows without dropping down to the raw Lance API.

Describe the solution you'd like

Add two @PublicAPI functions following the existing daft-lance pattern:

• update_lance(uri, updates, *, where=None, io_config=None) — thin wrapper around lance.dataset().update(), returns {"num_rows_updated": N}
• delete_from_lance(uri, where, *, io_config=None) — thin wrapper around lance.dataset().delete()

Additional Context

• Lance docs: https://lance.org/guide/read_and_write/
• Originally requested in Daft: feat: Add update and delete operations for Lance datasets Eventual-Inc/Daft#7012 (closed — non-core Lance functionality was moved here)

Would you like to implement a fix?

Yes, already have an implementation ready.