KIP-735 — Increase default consumer session timeout

Accepted Kafka 3.0 Consumer

Adds a per-consumer-group `session.timeout.ms` override capability so that individual groups can be configured with session timeouts outside the broker's global `[group.min/max.session.timeout.ms]` range. In multi-tenant cloud environments workloads have highly variable GC and network characteristics, making a single global timeout range inadequate for all groups.

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