KIP-338 — Support to exclude the internal topics in kafka-topics.sh command

Accepted Kafka 2.1 Admin

Adds an `--exclude-internal` flag to `kafka-topics.sh` to suppress internal topics (e.g., `__consumer_offsets`, `__transaction_state`) from `--list` and `--describe` output. Previously, operators had to pipe output through `grep -v '^__'` to filter internal topics, with no built-in mechanism.

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