feat: add kill_retry_time argument

[KimSeongIl]

Please always submit pull requests on the development branch.

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#1234, #3524
License	MIT
Doc PR	https://github.com/pm2-hive/pm2-hive.github.io/pulls

Please update this template with something that matches your PR

Too many logs are output at shutdown with graceful shutdown.

PM2        | pid=4382 msg=failed to kill - retrying in 100ms
PM2        | pid=4399 msg=failed to kill - retrying in 100ms
PM2        | pid=4364 msg=failed to kill - retrying in 100ms
PM2        | pid=4365 msg=failed to kill - retrying in 100ms
PM2        | pid=4382 msg=failed to kill - retrying in 100ms
PM2        | pid=4399 msg=failed to kill - retrying in 100ms
PM2        | pid=4364 msg=failed to kill - retrying in 100ms
PM2        | pid=4365 msg=failed to kill - retrying in 100ms
PM2        | pid=4382 msg=failed to kill - retrying in 100ms
PM2        | pid=4399 msg=failed to kill - retrying in 100ms
PM2        | pid=4364 msg=failed to kill - retrying in 100ms
PM2        | pid=4365 msg=failed to kill - retrying in 100ms
...........
...........

I think we should be able to set the retry time.