optimize: add StateType Enum

[MaoMaoandSnail]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

optimize: computeIfAbsent get twice
optimize: createProcessorController code order
optimize: add StateType Enum

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[funky-eyes]

Suggested change

	import java.util.*;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

[MaoMaoandSnail]

OK

[codecov]

Codecov Report

Attention: Patch coverage is 92.10526% with 3 lines in your changes missing coverage. Please review.

Project coverage is 52.62%. Comparing base (dbe095a) to head (95090e8).

Files with missing lines	Patch %	Lines
.../apache/seata/saga/statelang/domain/StateType.java	88.88%	1 Missing and 1 partial ⚠️
...saga/statelang/domain/impl/LoopStartStateImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x    #6891   +/-   ##
=========================================
  Coverage     52.61%   52.62%           
- Complexity     6579     6580    +1     
=========================================
  Files          1126     1127    +1     
  Lines         39928    39947   +19     
  Branches       4680     4683    +3     
=========================================
+ Hits          21010    21023   +13     
- Misses        16916    16918    +2     
- Partials       2002     2006    +4     

Files with missing lines	Coverage Δ
...ta/saga/statelang/domain/impl/ChoiceStateImpl.java	89.47% <100.00%> (ø)
...omain/impl/CompensateSubStateMachineStateImpl.java	100.00% <100.00%> (ø)
...lang/domain/impl/CompensationTriggerStateImpl.java	100.00% <100.00%> (ø)
...a/saga/statelang/domain/impl/FailEndStateImpl.java	100.00% <100.00%> (ø)
...aga/statelang/domain/impl/ScriptTaskStateImpl.java	100.00% <100.00%> (ø)
...ga/statelang/domain/impl/ServiceTaskStateImpl.java	75.00% <100.00%> (ø)
...aga/statelang/domain/impl/SubStateMachineImpl.java	100.00% <100.00%> (ø)
...aga/statelang/domain/impl/SucceedEndStateImpl.java	100.00% <100.00%> (ø)
...eata/saga/statelang/parser/StateParserFactory.java	91.66% <100.00%> (ø)
...saga/statelang/parser/utils/StateMachineUtils.java	92.30% <100.00%> (+0.64%)	⬆️
... and 3 more

... and 4 files with indirect coverage changes

[slievrly]

So many getValues are not very elegant, it is recommended to centralize them in the method.

[MaoMaoandSnail]

OK