KIP-316 — Command-line overrides for ConnectDistributed worker properties

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Adds `--override key=value` command-line argument support to `connect-distributed.sh` so that runtime-determined properties (e.g., `rest.port`) can be injected without modifying the properties file. Currently, `ConnectDistributed` accepts exactly one argument (the properties file path), requiring wrapper scripts to generate a temporary file for any runtime-variable config.

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