feat(schema): PDE-5719 split FieldSchema into InputFieldSchema, OutputFieldSchema, and AuthFieldSchema

[Natay]

https://zapierorg.atlassian.net/browse/PDE-5719

This pull request addresses the need to split the existing FieldSchema into three separate schemas: InputFieldSchema, OutputFieldSchema, and AuthFieldSchema. This change enhances the modularity and clarity of the schema definitions, making it easier to manage and extend them in the future for other use cases ( Agents, Canvas, unFurl )

[Natay]

@kola-er I addressed the changes and this is ready for a re-review, I am going to add some unit tests before taking it out of draft!

[kola-er]

@Natay Looking close, thank you. I left some comments. Also, with both FieldsSchema and DynamicFieldsSchema not being used anymore, I think they can be deleted.

[kola-er]

@Natay Please git squash all the commits into 1 commit of "Split FieldSchema into AuthFieldSchema, InputFieldSchema, OutputFieldSchema"

[Natay]

@kola-er I plan on squashing before merging if that's okay!

[kola-er]

Thanks for your effort. Looks good to go.

[Natay]

Thank you for all the guidance here @kola-er @FokkeZB !