[To dev/1.3] Subscription: support consumer timeout and idle disconnect

[VGalaxies]

cherry-pick #17293 to https://github.com/apache/iotdb/tree/dev/1.3

Summary

• backport consumer-side connectionTimeoutInMs plumbing to the older dev/1.3 subscription client layout
• add server-side idle disconnect based on subscription heartbeat inactivity and reuse closeConsumer(...) for timeout-triggered cleanup
• add receiver timeout coverage for SubscriptionReceiverV1

Verification

• mvn -T 8 spotless:apply -P with-integration-tests
• attempted mvn -T 8 -pl iotdb-core/datanode -am -Dtest=org.apache.iotdb.db.subscription.receiver.SubscriptionReceiverV1Test -Dsurefire.failIfNoSpecifiedTests=false test, but the build stops in the existing DataNode FMPP codegen step with ArithmeticUnaryColumnTransformer.ftl missing mathematicalDataType before reaching the subscription test
• per request, I did not continue running unit-test commands after that point

---

This PR was primarily authored with Codex using gpt-5.4 xhigh and then hand-reviewed by me. I AM responsible for every change made in this PR. I aimed to keep it aligned with our goals, though I may have missed minor issues. Please flag anything that feels off, I'll fix it quickly.