Put the new state machine into stateMachineMap even it exists

[steelcg]

Put the new state machine into stateMachineMap even the state machine exists in stateMachineMap to avoid "The state machine with id ["+machineId+"] is already built, no need to build again" exception when you are using spring-boot-devtools. If you are using spring-boot-devtools without configuration, the library "cola-statemachine" will be loaded in restartedClassLoader. when you modify code then click CTRL + F9. The new state machine will be put into stateMachineMap but it has existed then lead the error.

[CLAassistant]

All committers have signed the CLA.