fix: remove _TData abstraction

[tannerlinsley]

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Codecov Report

Patch coverage is 100.00% of modified lines.

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Files Changed	Coverage
packages/form-core/src/utils.ts	ø
packages/react-form/src/createFormFactory.ts	ø
packages/form-core/src/FieldApi.ts	100.00%
packages/form-core/src/FormApi.ts	100.00%
packages/react-form/src/useField.tsx	100.00%
packages/react-form/src/useForm.tsx	100.00%

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[tannerlinsley]

I'm a big fan of this change for a few reasons:

• Less code
• Uniform generic slot names and order across the library
• Still approachable for constraints e.g.