Demo components module

[Blackbaud-SteveBrush]

This branch essentially moves all demo components to an exported Demo module that can be consumed by other SPAs.

• Eventually, we will remove the documentation from this SPA, and move it elsewhere.

How to test:

Clone the docs SPA:

• Clone https://github.com/blackbaud/skyux2-docs
• Switch branch to first-release

Build UX components:

• Type npm run build
• Copy the dist folder into skyux2-docs/node_modules/@blackbaud/skyux
• Type skyux build -s to see the new demo components

[codecov-io]

Codecov Report

Merging #1350 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1350   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         370     370           
  Lines        6796    6788    -8     
  Branches      874     874           
======================================
- Hits         6796    6788    -8

Impacted Files	Coverage Δ
...s/link-records/link-records-item-diff.component.ts	100% <ø> (ø)	⬆️
...vertical-tabset/vertical-tabset-group.component.ts	100% <ø> (ø)	⬆️
src/modules/link-records/link-records.component.ts	100% <ø> (ø)	⬆️
src/modules/list/helpers.ts	100% <ø> (ø)	⬆️
...sectioned-form/sectioned-form-section.component.ts	100% <ø> (ø)	⬆️
...provider-in-memory/list-data-in-memory.provider.ts	100% <ø> (ø)	⬆️
src/modules/list/list.component.ts	100% <100%> (ø)	⬆️
...dules/vertical-tabset/vertical-tabset.component.ts	100% <100%> (ø)	⬆️

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[Blackbaud-SteveBrush]

@Blackbaud-BobbyEarl @Blackbaud-PaulCrowder I'd like to get this merged in before any other pull requests so we can get the docs separated and move on with new features ASAP.

[Blackbaud-PaulCrowder]

Is there a way for a developer contributing to the skyux2 repo to create the demo component and run it without having to do anything in the skyux2-docs repo? That would mirror what we had with skyux/skyux-docs.

[Blackbaud-PaulCrowder]

FYI the use of the TypeScript spread operator instead of .concat() might make this code a little more aesthetically pleasing.

        getCodeFiles: () => [
          ...this.getDemoFiles('SkyFilterDemoComponent'),
          ...this.getDemoFiles('SkyFilterInlineDemoComponent')
        ]