feature: transform desinger json to statemachine standard json

[long187]

Ⅰ. Describe what this PR did

We provided a Saga StateMachine Designer, State language json generated by the Designer has layout informations. We need transform it to standard Saga State language json.

Ⅱ. Does this pull request fix one issue?

#1948

Ⅳ. Describe how to verify it

run unit test at test/src/test/java/io/seata/saga/engine/StateMachineTests.java

Ⅴ. Special notes for reviews

The Json generated by the designer is different from the standard Json of the Saga state machine (because the json generated by the designer has layout information), This PR is In order to make the state machine can be directly loaded and it will be converted into the Json of the Saga state machine standard.

[codecov-io]

Codecov Report

Merging #1958 into develop will increase coverage by 0.18%.
The diff coverage is 79.84%.

@@              Coverage Diff              @@
##             develop    #1958      +/-   ##
=============================================
+ Coverage       55.3%   55.49%   +0.18%     
- Complexity      2409     2436      +27     
=============================================
  Files            429      430       +1     
  Lines          14278    14397     +119     
  Branches        1676     1707      +31     
=============================================
+ Hits            7897     7989      +92     
- Misses          5673     5682       +9     
- Partials         708      726      +18

Impacted Files	Coverage Δ	Complexity Δ
.../statelang/parser/impl/StateMachineParserImpl.java	72.5% <78.57%> (-5.28%)	8 <1> (+1)
...tatelang/parser/utils/DesignerJsonTransformer.java	80% <80%> (ø)	24 <24> (?)
...server/store/file/FileTransactionStoreManager.java	56.19% <0%> (-0.96%)	29% <0%> (ø)
...o/seata/server/coordinator/DefaultCoordinator.java	48.41% <0%> (+0.39%)	29% <0%> (+1%)	⬆️
...in/java/io/seata/server/session/GlobalSession.java	85.02% <0%> (+0.48%)	68% <0%> (+1%)	⬆️

[slievrly]

LGTM

[zhangthen]

+1