[Task] Type-widening for type of records we accept in ingest methods

[teodordelibasic-db]

Problem Statement
In order to give more flexibility to clients of the SDK, we should support both high and low level types for both JSON (dict/string) and Protobuf (message/bytes) streams.

Proposed Solution
In a non-breaking way widen the argument types of ingest methods.

Additional Context
How this is done in the zerobus-sdk-py: Type widening for accepted records.