Support the v2Checkpoint reader/writer feature

[sebastiantia]

Please describe why this is necessary.

This PR introduces foundational changes required for V2 checkpoint read support. The high-level changes required for v2 checkpoint support are:
Item 1. Allow log segments to be built with V2 checkpoint files
Item 2. Allow log segment replay functionality to retrieve actions from sidecar files if need be.

This issue tracks completion of Item 1, which will conclude the support for the v2Checkpoints reader/writer table feature for delta kernel rust by allowing snapshots to leverage UUID-named checkpoints as part of their log segment.

Describe the functionality you are proposing.

Allow V2 checkpoints to be included in log segments.
Allow protocol & metadata validation to pass for tables with the v2Checkpoints reader feature

Additional context

No response