Separate stories in angular-cli example

[igor-dv]

Issue: Angular examples are located mostly in one file.

What I did

I've extracted a few examples from the index.ts to the separate stories.

PS. This is a cherry-pick from #2564 to make it easier.

[codecov]

Codecov Report

Merging #2592 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2592   +/-   ##
=======================================
  Coverage   32.61%   32.61%           
=======================================
  Files         397      397           
  Lines        8855     8855           
  Branches      961      954    -7     
=======================================
  Hits         2888     2888           
+ Misses       5296     5294    -2     
- Partials      671      673    +2

Impacted Files	Coverage Δ
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/actions/src/lib/types/symbol/index.js	81.25% <0%> (ø)	⬆️
lib/components/src/table/cell.js	65.21% <0%> (ø)	⬆️
lib/codemod/src/transforms/update-addon-info.js	50% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	51.85% <0%> (ø)	⬆️
addons/actions/src/lib/util/typeReplacer.js	54.54% <0%> (ø)	⬆️
...tive/src/preview/components/StoryListView/index.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/addon_panel/index.js	34.78% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/shortcuts_help.js	25% <0%> (ø)	⬆️
... and 42 more

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[shilman]

adding this to patch release to satisfy dependency in #2646