KIP-481 — SerDe Improvements for Connect Decimal type in JSON

Accepted Kafka 2.4 Connect

Adds a `decimal.format` configuration to the `JsonConverter` (values: `BASE64`, `NUMERIC`) so that Connect Decimal schema fields can be serialized as human-readable decimal strings (e.g., `10.2345`) in addition to the existing BASE64-encoded binary representation. All existing JSON systems represent decimals as numeric strings, making Connect's BASE64 encoding incompatible with any JSON consumer that is not Kafka Connect–aware.

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