Feat: added tagInput component

[hirol888]

#2634 Please read and mark the following check list before creating a pull request:

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

Short description of what this resolves:

It converts an input value into a tag and adds the value into a tags string array. Tags can be removed or edited. It also allows to setup custom validators and auto complete etc.

[ghost]

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 90.37267% with 31 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 79.67%. Comparing base (d10275b) to head (9d4de2c). :warning: Report is 179 commits behind head on master.

Files with missing lines	Patch %	Lines
.../components/tag-input/tag-input-input.component.ts	88.61%	8 Missing and 6 partials :warning:
...me/components/tag-input/tag-input-tag.component.ts	87.61%	6 Missing and 8 partials :warning:
.../theme/components/tag-input/tag-input.component.ts	96.47%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2635      +/-   ##
==========================================
+ Coverage   79.09%   79.67%   +0.57%     
==========================================
  Files         258      263       +5     
  Lines        7966     8306     +340     
  Branches      872      899      +27     
==========================================
+ Hits         6301     6618     +317     
- Misses       1391     1402      +11     
- Partials      274      286      +12     

Files with missing lines	Coverage Δ
src/framework/theme/components/helpers.ts	71.42% <ø> (ø)
...ork/theme/components/tag-input/tag-input.module.ts	100.00% <100.00%> (ø)
.../theme/components/tag-input/tag-input.component.ts	96.47% <96.47%> (ø)
.../components/tag-input/tag-input-input.component.ts	88.61% <88.61%> (ø)
...me/components/tag-input/tag-input-tag.component.ts	87.61% <87.61%> (ø)

... and 3 files with indirect coverage changes

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[hirol888]

Anyone knows why 'continuous-integration/travis-ci' is waiting status for days?