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

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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