fix: multiple boolean handling / nested fields in builders (#15)

* fix: option type when creating new records

* Fix styling

* fix: field config error for datalistType

* Fix styling

* improve form data mutations to support switching multiple/single options

* add helper text to warn users

* clean up and explain code

* add nested fields and builder support

* Fix styling

* remove some of the comments

* change text and correct type hints

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Co-authored-by: Baspa <[email protected]>

Author: Baspa