[PIP-165] Auto release idle connections

[RobertIndie]

Motivation

The go implementation of PIP-165:apache/pulsar#15516

Modifications

• Add new configuration ConnectionMaxIdleTime to ClientOptions
• Add a goroutine to ConnectionPool to period check and release idle connections.

Verifying this change

This change added tests

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): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)

Documentation

• Does this pull request introduce a new feature? (yes)
• If yes, how is the feature documented? ( GoDocs)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[shibd]

@RobertIndie

It seems that the newly added unit test has a timeout.

time="2023-03-01T10:41:21Z" level=info msg="Connecting to broker" remote_addr="pulsar://localhost:6650"
time="2023-03-01T10:41:21Z" level=info msg="TCP connection established" local_addr="127.0.0.1:42264" remote_addr="pulsar://localhost:6650"
time="2023-03-01T10:41:21Z" level=info msg="Connection is ready" local_addr="127.0.0.1:42264" remote_addr="pulsar://localhost:6650"
    client_impl_test.go:1224: 
        	Error Trace:	/pulsar/pulsar-client-go/pulsar/client_impl_test.go:1224
        	Error:      	Expected nil, but got: &errors.errorString{s:"request timed out"}
        	Test:       	TestAutoCloseIdleConnection
coverage: 29.7% of statements
panic: test timed out after 20m0s

[RobertIndie]

@RobertIndie

It seems that the newly added unit test has a timeout.

time="2023-03-01T10:41:21Z" level=info msg="Connecting to broker" remote_addr="pulsar://localhost:6650"
time="2023-03-01T10:41:21Z" level=info msg="TCP connection established" local_addr="127.0.0.1:42264" remote_addr="pulsar://localhost:6650"
time="2023-03-01T10:41:21Z" level=info msg="Connection is ready" local_addr="127.0.0.1:42264" remote_addr="pulsar://localhost:6650"
    client_impl_test.go:1224: 
        	Error Trace:	/pulsar/pulsar-client-go/pulsar/client_impl_test.go:1224
        	Error:      	Expected nil, but got: &errors.errorString{s:"request timed out"}
        	Test:       	TestAutoCloseIdleConnection
coverage: 29.7% of statements
panic: test timed out after 20m0s

@shibd Thanks. It's a deadlock issue. I have fixed it.