fix(Form): improve onFieldsChange params type defs

[SylvanasGone]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

👻 What's the background?

onFieldsChange's second param changeFields type is so restrictive that users have to cast the actual def when using it in Typescript.

💡 Solution

Replace type definition object with any.

📝 Changelog

• English Changelog: Improve onFieldsChange params type of Form.create() method in Form.
• Chinese Changelog (optional):

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[codecov]

Codecov Report

Merging #16577 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #16577   +/-   ##
=======================================
  Coverage   95.71%   95.71%           
=======================================
  Files         258      258           
  Lines        7120     7120           
  Branches     1970     2004   +34     
=======================================
  Hits         6815     6815           
  Misses        303      303           
  Partials        2        2

Impacted Files	Coverage Δ
components/form/Form.tsx	91.3% <ø> (ø)	⬆️

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6379999...8c8ca49. Read the comment docs.

[codecov]

Codecov Report

Merging #16577 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #16577   +/-   ##
=======================================
  Coverage   95.71%   95.71%           
=======================================
  Files         258      258           
  Lines        7120     7120           
  Branches     1970     2004   +34     
=======================================
  Hits         6815     6815           
  Misses        303      303           
  Partials        2        2

Impacted Files	Coverage Δ
components/form/Form.tsx	91.3% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6379999...8c8ca49. Read the comment docs.