fix the panic: send on closed channel

[dxsup]

Description

Fix the panic: send on closed channel.

Related Issue

Motivation and Context

There are two solutions available:

• Close the channel on the sender side. We have to add some checks to ensure everything functions correctly.
• Do not close the channel and ensure it can be garbage collected when profiling is disabled, without any memory leaks or blocked goroutines. This can be achieved by listening to a "stop" channel and removing references to the old channel when disabling the profiling.

I have chosen the second solution to fix this bug. I renew the relevant channels and maps during the start and stop phases of profiling to ensure they are empty. Since starting and stopping profiling are both infrequent operations, the overhead on performance will be minimal.