Before Creating the Enhancement Request
Summary
Adding rejection Policy Parameters to the ThreadPoolMonitor ,Convenient for caller's setting of rejection Policy
Motivation
When setting the rejection policy for the current caller, it is necessary to first create the thread pool and then set the rejection policy. The creation of the thread pool originally supports the rejection policy, and it should not be separated from the setting of the rejection policy.
for example:
path: org.apache.rocketmq.proxy.grpc.v2.GrpcMessagingApplication#GrpcMessagingApplication
first create the thread pool and then set the rejection policy.

Describe the Solution You'd Like
Adding rejection Policy Parameters to the ThreadPoolMonitor and to support setting rejection policies when creating
Describe Alternatives You've Considered
There should be no need for other solutions
Additional Context
No response