Angular Add custom pipes support

[igor-dv]

Issue: #2514

What I did

Added pipes array to story definition to provide custom pipes to the NgModule

How to test

TBD

[codecov]

Codecov Report

Merging #2518 into release/3.3 will decrease coverage by <.01%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##           release/3.3   #2518      +/-   ##
==============================================
- Coverage        19.51%   19.5%   -0.01%     
==============================================
  Files              386     386              
  Lines             8706    8709       +3     
  Branches           928     951      +23     
==============================================
  Hits              1699    1699              
+ Misses            6320    6283      -37     
- Partials           687     727      +40

Impacted Files	Coverage Δ
addons/knobs/src/angular/helpers.js	0% <0%> (ø)	⬆️
addons/info/src/components/types/Signature.js	16.66% <0%> (ø)	⬆️
addons/actions/src/lib/index.js	7.14% <0%> (ø)	⬆️
...ents/stories_panel/stories_tree/tree_decorators.js	34.37% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
addons/info/src/components/types/proptypes.js	16.66% <0%> (ø)	⬆️
addons/actions/src/lib/types/nan/index.js	29.41% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	51.85% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	41.17% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
... and 57 more

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[ndelangen]

I can only approve from a code-practice point of view, I have no idea if this change makes sense, I do not know angular well enough.

Feel free to merge if you're sure this is the right thing to do.

[igor-dv]

@alterx has approved on slack as well.