parse和transformApi可以更加灵活

### Is your feature request related to a problem? Please describe.

parse和transformApi不够灵活，只能定义在外部。不方便使用

### Description

parse和transformApi可以更加灵活，以便于去编辑和保存它

### Describe the solution you'd like

parse和transformApi可以更加灵活，每个表单项可以独立配置

### Describe alternatives you've considered

_No response_

### Self-service

- [X] I'd be willing to contribute this feature to DripForm myself.