feat(module:icon): add injectiontoken config and default twotone color

[wzhudev]

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
[x] 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

[codecov]

Codecov Report

Merging #2353 into master will increase coverage by 0.02%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master    #2353      +/-   ##
==========================================
+ Coverage   95.86%   95.88%   +0.02%     
==========================================
  Files         485      485              
  Lines       12241    12253      +12     
  Branches     1656     1660       +4     
==========================================
+ Hits        11735    11749      +14     
+ Misses        149      148       -1     
+ Partials      357      356       -1

Impacted Files	Coverage Δ
components/icon/nz-icon.service.ts	95.74% <92.85%> (-1.4%)	⬇️
components/time-picker/time-holder.ts	96.93% <0%> (+1.02%)	⬆️
components/table/nz-table.component.ts	96.66% <0%> (+1.11%)	⬆️

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