support eager thread pool

[codecov[bot]]

Codecov Report

Merging #1230 (6ebf72e) into master (cf4445a) will increase coverage by 0.02%. The diff coverage is 84.09%.

@@             Coverage Diff              @@
##             master    #1230      +/-   ##
============================================
+ Coverage     72.02%   72.04%   +0.02%     
+ Complexity      780      779       -1     
============================================
  Files           410      414       +4     
  Lines         17375    17417      +42     
  Branches       2703     2705       +2     
============================================
+ Hits          12514    12548      +34     
- Misses         3479     3484       +5     
- Partials       1382     1385       +3     

Impacted Files	Coverage Δ
...lipay/sofa/rpc/thread/EagerThreadPoolExecutor.java	60.00% <60.00%> (ø)
...lipay/sofa/rpc/thread/EagerThreadPoolSupplier.java	80.00% <80.00%> (ø)
.../java/com/alipay/sofa/rpc/server/BusinessPool.java	90.00% <100.00%> (+4.28%)	:arrow_up:
...lipay/sofa/rpc/thread/FixedThreadPoolSupplier.java	100.00% <100.00%> (ø)
...ain/java/com/alipay/sofa/rpc/thread/TaskQueue.java	100.00% <100.00%> (ø)
...m/alipay/sofa/rpc/common/config/RpcConfigKeys.java	93.75% <100.00%> (+0.41%)	:arrow_up:
...sian/MultipleClassLoaderSofaSerializerFactory.java	86.66% <0.00%> (-6.67%)	:arrow_down:
.../alipay/sofa/rpc/metrics/lookout/RpcLookoutId.java	87.30% <0.00%> (-1.59%)	:arrow_down:
...om/alipay/sofa/rpc/server/triple/TripleServer.java	74.86% <0.00%> (-1.07%)	:arrow_down:
...lipay/sofa/rpc/message/AbstractResponseFuture.java	57.01% <0.00%> (+0.87%)	:arrow_up:
... and 2 more

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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[OrezzerO]

I think eager thread pool has same affect to set core size equals to max size. So it is not necessary to implement eager thread pool. If you have some cases which must use eager thread pool, feel free to open this PR and @me.