KIP-1115 — Bazel Builds

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Proposes migrating Apache Kafka's build system from Gradle to Bazel, leveraging Bazel's fine-grained build graph, aggressive caching, and hermetic toolchains. Gradle builds had non-deterministic dependency graphs (no lockfile), per-module dependency resolution (risking version conflicts), and CI times of ~2 hours average, while internal Confluent Bazel builds achieved ~30-minute average CI times.

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