feat(components): extract CompositeEditor & EmptyWarning Components

[ghiscoding]

• extract into 2 separate monorepo packages so it can be used in other frameworks like Aurelia-Slickgrid
• keep full unit test coverage on both components

[codecov]

Codecov Report

Merging #191 (8573fca) into master (b856c47) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #191   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          202       204    +2     
  Lines        11779     11781    +2     
  Branches      4025      4025           
=========================================
+ Hits         11779     11781    +2     

Impacted Files	Coverage Δ
...-component/src/slick-composite-editor.component.ts	100.00% <ø> (ø)
...ing-component/src/slick-empty-warning.component.ts	100.00% <ø> (ø)
packages/composite-editor-component/src/index.ts	100.00% <100.00%> (ø)
packages/empty-warning-component/src/index.ts	100.00% <100.00%> (ø)
...bundle/src/components/slick-vanilla-grid-bundle.ts	100.00% <100.00%> (ø)
packages/vanilla-bundle/src/index.ts	100.00% <100.00%> (ø)

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