* implement cel expression

* move sequence expression into a new file

* mv expression factory into a new file

* move expression factory manager into a new file

* implement cel expression factory and add test

* move expression resolver into a new file

* add parse expression struct test

* update

* update go.mod

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Co-authored-by: FengZhang <zfcode@qq.com>

* added yaml format of statelang related test data

* feature: implement multi type config parser

* adjust statemachine_json_parser to suit config parser

* bugfix: fix the problem of failure to parse "ServiceName"

* adjust statemachine_parser to be compatible with yaml

* add apache License, add some comments, and make some logical adjustments

* update state_machine_new_designer.yaml

* optimize and improve the unit test of config parser

* refactor config parser

* add apache License

* update

init saga framework