feat: accept icon config in components which use nb-icon

[yggg]

Please read and mark the following check list before creating a pull request:

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

Closes #1851
Closes #1323

[codecov]

Codecov Report

Merging #1935 into master will decrease coverage by 0.06%.
The diff coverage is 72.41%.

@@            Coverage Diff             @@
##           master    #1935      +/-   ##
==========================================
- Coverage   84.14%   84.08%   -0.07%     
==========================================
  Files         234      234              
  Lines        7703     7723      +20     
  Branches      675      679       +4     
==========================================
+ Hits         6482     6494      +12     
- Misses       1023     1031       +8     
  Partials      198      198

Impacted Files	Coverage Δ
.../components/route-tabset/route-tabset.component.ts	83.33% <ø> (ø)	⬆️
...rc/framework/theme/components/menu/menu.service.ts	87.32% <ø> (ø)	⬆️
.../framework/theme/components/icon/icon.component.ts	96.29% <100%> (+0.94%)	⬆️
...work/theme/components/actions/actions.component.ts	100% <100%> (ø)	⬆️
...mework/theme/components/tabset/tabset.component.ts	92% <100%> (ø)	⬆️
...work/theme/components/tooltip/tooltip.component.ts	100% <100%> (ø)	⬆️
...work/theme/components/tooltip/tooltip.directive.ts	100% <100%> (ø)	⬆️
...framework/theme/components/toastr/toastr-config.ts	95.23% <100%> (ø)	⬆️
...amework/theme/components/toastr/toast.component.ts	48.64% <20%> (-12.07%)	⬇️