feat(components): adding fill to toggled on icon button

[owilliams320]

Description

Setting icon toggle button to be "filled" when toggled on

What's included?

• icon filled when selected
• adding icon toggle to app shell story

Test Steps

• [ ] npm run storybook
• [ ] then navigate to the icon toggle button story
• [ ] finally click the icon toggle on/off to observe fill change

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

https://github.com/Teradata/covalent/assets/3837706/8a597b69-228d-4960-9556-544a26ed6e22

[adamnel]

Fill toggling looks good. We made a modification to the toggled state vs default material to leave a highlight effect behind it when active, which is missing here though:

[owilliams320]

:tada: This PR is included in version 8.10.0 :tada:

The release is available on:

• v8.10.0
• GitHub release

Your semantic-release bot :package::rocket: