auto-pause: make it memory-leak proof

[medyagh]

each call of time.After creates a new timer instance which is not released until the timer fired. If we have high traffic in incomeCh we'll end up with a lot of pending timers

https://groups.google.com/g/golang-nuts/c/cCdm0Ixwi9A

Originally posted by @ilya-zuyev in #10427 (comment)

https://www.fatalerrors.org/a/use-with-caution-time.after-can-cause-memory-leak-golang.html

[hetong07]

/assign

[medyagh]

@hetong07 thanks for picking this up, let me know if u need help or have questions