[client-v2] Fix Bitmap SerDe

[chernser]

Summary

Checklist

Delete items not relevant to your PR:

• [x] Unit and integration tests covering the common scenarios were added
• [ ] A human-readable description of the changes was provided to include in CHANGELOG
• [ ] For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

[mzitnik]

@chernser, can you explain exactly what was fixed? (do we have a issue ti describe?)

[chernser]

@mzitnik I've updated the PR description.

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
68.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud