docs(icon-demo): add an icon demo to display all icons

[bsahitya]

Description

Add an icon-demo web component in covalent/components. To display all icons in a demo in knapsack we need to either create an angular or web component and add it to a custom demo in knapsack.

What's included?

• Add icon-demo component in components
• Add a custom demo for all icons in icon docs of knapsack
• Use the newly created component in custom demo
• Integrate the icon-demo into the icon overview page in knapsack

Test Steps

• npm run storybook
• then go to Icon/All icons story
• nx run knapsack:start
• Open Icon docs and view the overview page

General Tests for Every PR

• npm run start still works.
• npm run lint passes.
• npm run stylelint passes.
• npm test passes and code coverage is not lower.
• npm run build still works.

Screenshots or link to StackBlitz/Plunker

[adamnel]

Can we create filtered versions of this? For example, I'd like to be able to embed a listing of the state_* icons on the relevant page for reference in the docs.

[owilliams320]

🎉 This PR is included in version 9.1.1 🎉

The release is available on:

• v9.1.1
• GitHub release

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