feat(form): support validation change events

[platosha]

Fixes #2702

[codecov]

Codecov Report

Attention: Patch coverage is 75.67568% with 9 lines in your changes missing coverage. Please review.

Project coverage is 92.33%. Comparing base (3d07524) to head (affe730).

Files with missing lines	Patch %	Lines
packages/ts/lit-form/src/Field.ts	71.87%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2902      +/-   ##
==========================================
- Coverage   92.56%   92.33%   -0.23%     
==========================================
  Files          84       84              
  Lines        3160     3183      +23     
  Branches      772      775       +3     
==========================================
+ Hits         2925     2939      +14     
- Misses        183      190       +7     
- Partials       52       54       +2     

Flag	Coverage Δ
unittests	92.33% <75.67%> (-0.23%)	⬇️

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[Lodin]

I see several issues in SonarCloud and incomplete coverage from Codecov. Would it be possible to fix them?

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.7% Duplication on New Code

See analysis details on SonarQube Cloud