Description

This PR has guaranteed that: No more newly generated event will be sent after a successful pipe drop.
Contents:

1. Banned any events from the retry-queue(asyncSink) and pending-queue(sinkSubtask)
2. Cleared the pending queue in web socket sink
3. Added creation time in pipe clear check

Test

Reuse pipe (empty + data) -> kill receiver -> drop data pipe

This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods.
• added or updated version, license, or notice information
• added comments explaining the "why" and the intent of the code wherever would not be obvious
  for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold
  for code coverage.
• added integration tests.
• been tested in a test IoTDB cluster.

Key changed/added classes (or packages if there are too many classes) in this PR