KIP-648 — Renaming getter method for Interactive Queries

Accepted Kafka 2.5 Streams

Renames `KeyQueryMetadata` getter methods from `getActiveHost()`, `getStandbyHosts()`, and `getPartition()` to `activeHost()`, `standbyHosts()`, and `partition()` to match Kafka's convention of not using `get` prefixes for accessor methods. The methods were added in KIP-535 with `get` prefixes that violated the established Kafka API naming convention.

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