feat(module:steps): step supports enable and disable

[stygian-desolator]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/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

close #5579

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6101 (7da2e82) into master (1d7964e) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6101      +/-   ##
==========================================
+ Coverage   89.82%   89.88%   +0.05%     
==========================================
  Files         465      465              
  Lines       14095    14101       +6     
  Branches     2236     2236              
==========================================
+ Hits        12661    12674      +13     
+ Misses        882      873       -9     
- Partials      552      554       +2     

Impacted Files	Coverage Δ
components/steps/step.component.ts	97.72% <100.00%> (+0.35%)	⬆️
components/core/util/text-measure.ts	89.56% <0.00%> (-1.74%)	⬇️
components/table/src/table-style.service.ts	94.82% <0.00%> (-1.73%)	⬇️
components/time-picker/time-holder.ts	94.73% <0.00%> (-1.06%)	⬇️
components/tabs/tab-nav-bar.component.ts	82.33% <0.00%> (+0.70%)	⬆️
components/table/src/table-data.service.ts	84.61% <0.00%> (+6.15%)	⬆️
components/table/src/table/tr-measure.component.ts	100.00% <0.00%> (+13.63%)	⬆️
components/table/src/table/tbody.component.ts	100.00% <0.00%> (+14.28%)	⬆️

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