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feat(internal): api level internals (#393)

* feat(internal): api level internals

expose `api_level` on ServerInfo (server 2.11+)

ADR-44 header opt-in (requires server 2.12+)
- JetStreamManagerOptions.sendRequiredApiLevel?: boolean (hidden, default off)
- When on, stream/consumer create/update sends Nats-Required-Api-Level: <N> header
- Server (2.12+) rejects with api level not supported instead of silently dropping unknown fields
- On pre-2.12 server, header is ignored — flag is a no-op

Per-config level computation (when flag on)
- Stream: level 1 (TTL/marker), level 2 (counter/atomic/schedules/persist_mode=async), level 4
  (allow_batched)
- Consumer: level 1 (pause_until/priority_*)

Signed-off-by: Alberto Ricart <alberto@synadia.com>

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