[BUG] Badge is missing theme colors when used as standalone component

[x] I have written a good issue

Describe the bug

When importing Badge as a standalone component the ThemeColorDirective is not applied because of the way Angular works with imported directives in standalone components.

TL;DR Imported directives in standalone components are only applied to the component's template, not the component itself. For this to work the directive needs to be specified in the component decorator's hostDirectives property.

Describe how to reproduce the bug

Create a blank Angular application
Import the BadgeComponent (not the entire KirbyModule)
Use the Badge with themeColor applied: <kirby-badge themeColor="danger">I'm not red :(</kirby-badge>
See the Badge not being rendered with danger color

Which Kirby version was used?

9.0.0

What was the expected behavior?

Themecolor being applied correctly when importing the Badge as a standalone component.

Are there any additional context?

The test for Badge imports the ThemeColorDirective which gives a false positive on the theme color tests. This should be removed. This also applies to the Avatar component.

Additionally the ModalFooter component uses the ThemeColorDirective only to apply the light css class. This could/should be changed to a HostBinding attribute instead for simplicity.

Checklist:

The following tasks should be carried out in sequence in order to follow the process of contributing correctly.

Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

[ ] Make sure the NOT verified label has been removed by a member of team Kirby; do not proceed until this is done

Implementation

The contributor who wants to implement this issue should:

[ ] Make sure you have read: "Before you get coding".
[ ] Signal to others you are working on the issue by assigning yourself.
[ ] Create a branch from the develop branch following our branch naming convention.
[ ] Create a test that reproduces the bug following guidelines in: "The good: Test".
[ ] Write code to fix the bug

Review

Once the issue has been implemented and is ready for review:

[ ] Do a self-review.
[ ] Create a pull-request.

kirbydesign / designsystem