KIP-362 — Support dynamic gap session window

Discussion Streams

Adds a DynamicSessionWindows type to the Streams DSL, allowing the session gap to be computed per-record from a user-supplied SessionWindowMergeCallback rather than being a fixed global value. Real-world session semantics often depend on record content (e.g., user tier, event type), which is impossible to express with a fixed inactivity gap.

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