[help] goroutine leak

#### Actual behavior
By using pprof, I found the goroutine leak of pulsar client. How can I locate this problem？
Does anyone have an architecture diagram or introduction of pulsar client go ？

#### System configuration
**Pulsar version**: 0.6.0

Start by reproducing the reported goroutine leak with pprof against Pulsar client Go version 0.6.0, then trace the client architecture to identify which component owns the leaked goroutines. The issue names no source file or test; done means locating and documenting the leak's cause and the affected client component.

Written by the indexing model from the issue text.