1.29 conformance fixes

[neoaggelos]

Summary

Update k8s-dqlite to pass the Kubernetes 1.29 conformance tests

Changes

• Compaction only ignores the last 100 revisions (from 1000).
• List responses return keys in alphabetical order.
• List requests with paging now return the correct Count of results that remain
• List requests with paging properly handle the start key.
• Properly handle list responses where the keys revisions are not in alphabetical order.

See the individual commits for details. Each commit is accompanied by a test case that doesn't work without the introduced changes.

[ktsakalozos]

LGTM +1