feat(components): add card component

[desmondinho]

Description

Add card component to the library of components.

Closes #12

What's been done?

Added card and card related components with the following abilities:

Card

• Set the radius of the card corners (e.g., none, medium)
• Set the shadow (e.g., none, small)
• Set the full-width state
• Set the blurred state (backdrop)
• Set CSS class names for each slot (e.g., card itself, card footer)

CardFooter

• Set the blurred state (backdrop)

--

Introduced the concept of the components with slots. It means that you can style all the parts inside the component using the Classes parameter. For example, the LumexCard component has the following slots:

1. Root: the root slot of the card, it is the main container.
2. Header: the wrapper of the card header component.
3. Body: the wrapper of the card body component.
4. Footer: the wrapper of the card footer component.

Checklist

• [x] My code follows the project's coding style and guidelines.
• [x] I have included inline docs for my changes, where applicable.
• [x] I have added, updated or removed tests according to my changes.
• [x] All tests are passing.
• [x] There's an open issue for the PR that I am making.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.54%. Comparing base (6106985) to head (e35473f). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #13 +/- ## ========================================== + Coverage 99.50% 99.54% +0.04% ========================================== Files 21 27 +6 Lines 598 654 +56 Branches 42 43 +1 ========================================== + Hits 595 651 +56 Misses 1 1 Partials 2 2 ```

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