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Sean Perkins 284eb8ecaf feat: add ionic theme architecture (#29132)
Issue number: Internal

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## What is the current behavior?
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## What is the new behavior?
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this PR. -->

Adds the base architecture to add a new theme configuration to Ionic
Framework components.
- Components can now specify an additional stylesheet for the `ionic`
theme.
- Developers can specify the `theme` and `mode` independently to control
look and feel of a component.

Test infrastructure has been updated to add support for testing the
theme configuration with Playwright.
- Existing `themes` test configuration has been renamed to `palettes`

This PR is just the initial effort to decouple Ionic's architecture to
separate look and feel and allow our dev team to start introducing the
new component appearance to the UI. There will be additional changes
required to completely add support for the Ionic theme. These changes
are targeted against the `next` branch and are not expected to be used
in a production environment at this time.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

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Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>
Co-authored-by: Brandy Carney <brandyscarney@users.noreply.github.com>
2024-03-18 15:45:01 -04:00
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