feat(datepicker): added month view

[valorkin]

added month\year selection views
added min\max dates boundaries

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (development@48186fd). Click here to learn what that means.
The diff coverage is 36.98%.

@@              Coverage Diff               @@
##             development    #2540   +/-   ##
==============================================
  Coverage               ?   66.63%           
==============================================
  Files                  ?      178           
  Lines                  ?     4829           
  Branches               ?      762           
==============================================
  Hits                   ?     3218           
  Misses                 ?     1311           
  Partials               ?      300

Impacted Files	Coverage Δ
src/bs-moment/format-functions.ts	100% <ø> (ø)
src/datepicker/reducer/_defaults.ts	100% <ø> (ø)
src/datepicker/reducer/bs-datepicker.reducer.ts	11.32% <10.89%> (ø)
...tepicker/themes/bs/bs-calendar-layout.component.ts	100% <100%> (ø)
src/datepicker/models/index.ts	100% <100%> (ø)
src/datepicker/bs-datepicker.config.ts	100% <100%> (ø)
...picker/themes/bs/bs-custom-dates-view.component.ts	100% <100%> (ø)
src/datepicker/bs-datepicker.module.ts	88.88% <100%> (ø)
...themes/bs/bs-datepicker-day-decorator.directive.ts	80% <100%> (ø)
src/datepicker/reducer/bs-datepicker.state.ts	100% <100%> (ø)
... and 25 more

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[YevheniiaMazur]

Tested, looks good