feat: nested objects/arrays

[logaretm]

🔎 Overview

This PR adds the ability to structure form fields into nested objects #2890

Todo:

• Nested Objects
• Support for initial values
• Nested Arrays
• Cleaning up nested values (after unmount)
• A way to opt-out of the nesting
• Write Docs

Example:

<Form @submit="onSubmit">
  <Field name="user.name" rules="required"  />
  <Field name="user.password" type="password" rules="required"  />
  <Field name="user.social[0]" type="url" rules="required"  />
  <Field name="user.social[1]" type="url" rules="required"  />

  <button id="submit">Submit</button>
</Form>

Submitting the above form will result in the following values:

{
  user: {
    name: "John Doe",
    password: "123456",
    social: [
       "link1",
       "link2"
    ]
  }
}

✔ Issues affected

closes #2890

[codecov]

Codecov Report

Merging #2897 into next will decrease coverage by 0.09%.
The diff coverage is 97.91%.

@@            Coverage Diff             @@
##             next    #2897      +/-   ##
==========================================
- Coverage   98.06%   97.97%   -0.10%     
==========================================
  Files          47       47              
  Lines         880      936      +56     
  Branches      192      206      +14     
==========================================
+ Hits          863      917      +54     
- Misses         16       18       +2     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/core/src/Form.ts	94.73% <ø> (ø)
packages/core/src/utils/common.ts	96.00% <96.00%> (ø)
packages/core/src/useField.ts	98.37% <100.00%> (ø)
packages/core/src/useForm.ts	98.64% <100.00%> (ø)
packages/core/src/utils/assertions.ts	100.00% <100.00%> (ø)
packages/core/src/utils/index.ts	100.00% <100.00%> (ø)

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