optimize: let DefaultCoordinator invoke NettyRemotingServer 's close() method

[Pinocchio2018]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

let DefaultCoordinator invoke NettyRemotingServer 's close() method, no longer invoked by ServerRunner
to avoid RegistryService 's close() invoked twice

Ⅱ. Does this pull request fix one issue?

fixes #4172

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #4300 (7c5e979) into develop (d6efb49) will decrease coverage by 0.01%.
The diff coverage is 42.85%.

❗ Current head 7c5e979 differs from pull request most recent head 1afa55d. Consider uploading reports for the commit 1afa55d to get more accurate results

@@              Coverage Diff              @@
##             develop    #4300      +/-   ##
=============================================
- Coverage      48.54%   48.53%   -0.02%     
+ Complexity      3794     3791       -3     
=============================================
  Files            724      724              
  Lines          24239    24244       +5     
  Branches        2970     2971       +1     
=============================================
  Hits           11767    11767              
- Misses         11230    11234       +4     
- Partials        1242     1243       +1     

Impacted Files	Coverage Δ
.../io/seata/core/rpc/netty/NettyServerBootstrap.java	0.00% <ø> (ø)
...o/seata/discovery/registry/RegistryHeartBeats.java	0.00% <0.00%> (ø)
...o/seata/server/coordinator/DefaultCoordinator.java	49.21% <60.00%> (+0.28%)	⬆️
...n/src/main/java/io/seata/common/util/IdWorker.java	77.08% <0.00%> (-6.25%)	⬇️

[funky-eyes]

LGTM