KIP-666 — Add Instant-based methods to ReadOnlySessionStore

Accepted Kafka 3.0 Streams

Adds `Instant`-based query methods to `ReadOnlySessionStore` interactive query API, aligning it with the `Instant`-based API already introduced for `ReadOnlyWindowStore` in KIP-358. The session store API still used millisecond `long` parameters, creating an inconsistency that forced users to manage timestamp conversions manually.

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