[ISSUE #4195] Do some code optimization.[SubscribeProcessor]

[gautamsagar99]

Fixes #4195

Motivation

To solve below two issues:

1. transient is used to mark fields in a Serializable class which will not be written out to file (or stream). In a class that does not implement Serializable, this modifier is simply wasted keystrokes, and should be removed.
2. Dereference of 'subscriptionItems' may produce 'NullPointerException'

Modifications

1. I have added a static keyword.
2. I have added Objects.requireNonNull() for the subscriptionItems list.

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)
• If a feature is not applicable for documentation, explain why? (Fixed small issue)

[github-actions]

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[pandaapo]

The rest of CI errors are being fixed by PR #4063.
You can wait for that PR to be merged, and then you pull newest master code and merge it into this branch.

[gautamsagar99]

I would like to extend my sincere thanks to @pandaapo and @Alonexc for their valuable assistance in resolving this PR. Their insights and guidance were instrumental in tackling the challenges effectively. 🙌🏼 This being my first open-source project, their help was incredibly valuable and made the experience much smoother.

[Alonexc]

Welcome to the EventMesh community. ci error is not related to your pr, but you can try to fix it.

[pandaapo]

@gautamsagar99 PR #4063 was merged. You can update your master branch and merge it into this. Then CI errors will be resolved.

[mxsm]

@gautamsagar99 Merge or rebase master branch to fix CI.

[codecov]

Codecov Report

Merging #4383 (48293df) into master (8f584d5) will increase coverage by 0.02%.
Report is 7 commits behind head on master.
The diff coverage is 46.15%.

❗ Current head 48293df differs from pull request most recent head fbd6072. Consider uploading reports for the commit fbd6072 to get more accurate results

@@             Coverage Diff              @@
##             master    #4383      +/-   ##
============================================
+ Coverage     17.81%   17.84%   +0.02%     
- Complexity     1512     1514       +2     
============================================
  Files           601      602       +1     
  Lines         25495    25520      +25     
  Branches       2400     2400              
============================================
+ Hits           4543     4555      +12     
- Misses        20514    20526      +12     
- Partials        438      439       +1     

Files Changed	Coverage Δ
...nnector/s3/source/connector/S3SourceConnector.java	0.00% <0.00%> (ø)
...re/protocol/grpc/processor/SubscribeProcessor.java	0.00% <0.00%> (ø)
.../tcp/client/session/retry/EventMeshTcpRetryer.java	0.00% <0.00%> (ø)
...pache/eventmesh/runtime/util/ThreadPoolHelper.java	75.00% <75.00%> (ø)

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[mxsm]

How about changing “grpcType” to “GRPC_TYPE”?