Add KvReadContext to KvRecordBatchBuilder and return CompactedRows on read_from

[fresh-borzoni]

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Description

There is TODO in KvRecord:
/// TODO: Connect KvReadContext and return CompactedRow records.

I splitted the inital task #111 to two parts:

1. Write logic and all abstractions
2. CompactedRow support for read_from for KvRecord

Willingness to contribute

• I'm willing to submit a PR!