[Broker] Remove subscription when closing Reader on non-persistent topics

[gaoran10]

Motivation

Currently, the subscription will not be removed when closing the non-persistent topic reader.

Modifications

Add a new field isDurable in NonPersistentSubscription, if the field is false the non-persistent subscription should be removed when closing the subscription(Such as a Reader subscription), or the subscription will be retained(Such as a Consumer subscription).

Verifying this change

Add a new unit test to verify the reader subscription could be removed.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

For committer

For this PR, do we need to update docs?

• If no, label this PR with the no-need-doc label and explain why.