feat(form): add setDisabled, setRequired method

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[ng-alain-bot]

Preview is ready!

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5eafa8f) 94.94% compared to head (b50e232) 94.93%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
packages/form/src/sf.component.ts	90.90%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1733      +/-   ##
==========================================
- Coverage   94.94%   94.93%   -0.01%     
==========================================
  Files         316      316              
  Lines        8904     8926      +22     
  Branches     1679     1772      +93     
==========================================
+ Hits         8454     8474      +20     
  Misses        379      379              
- Partials       71       73       +2     

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[cipchk]

Preview is ready!