feature: improve error handling for @formspree/core

[bhongy]

Changes

• @formspree/core submitForm function now will never rejects but always produces a type of SubmissionResult, different types of the result can be refined/narrowed down using the field kind.
• Provide SubmissionErrorResult which can be used to get an array of form errors and/or field errors (by field name)
• Response is no longer made available on the submission result
• Update @formspree/react for the changes introduced to @formspree/core

Code quality improvements

• Address eslint warnings (3 in core, 18 in react)

• Improve test coverage

  @formspree/core

  File	% Stmts	% Branch	% Funcs	% Lines
  All files (before)	72.04	57.57	90.47	71.91
  All files (after)	94.91	86.59	96.15	94.82

  @formspree/react

  File	% Stmts	% Branch	% Funcs	% Lines
  All files (before)	70.31	51.94	70.37	72.58
  All files (after)	70.47	50.76	63.15	70.47

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b6024a3027071fa59d1f919ef049db15df9bddd7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ---------------- | ----- | | @formspree/core | Major | | @formspree/react | Minor |

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Name	Status	Preview	Comments	Updated (UTC)
formspree-react-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 26, 2023 8:04am

[bhongy]

re-r? @colevscode I think I addressed or answered to all your questions.