KIP-477 — Add PATCH method for connector config in Connect REST API

Accepted Kafka 3.8 Connect

Adds HTTP PATCH support to the /connectors/{id}/config endpoint in the Kafka Connect REST API, enabling partial connector configuration updates that merge the provided fields into the existing config without replacing the entire document. The existing PUT-only approach required a GET-modify-PUT cycle that was non-atomic and error-prone, with a race window where concurrent modifications could overwrite each other.

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