refactor(Switch): api improvements

[elite-benni]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/goetzrobin/spartan/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

Which package are you modifying?

• [ ] accordion
• [ ] alert
• [ ] alert-dialog
• [ ] aspect-ratio
• [ ] avatar
• [ ] badge
• [ ] button
• [ ] calendar
• [ ] card
• [ ] checkbox
• [ ] collapsible
• [ ] combobox
• [ ] command
• [ ] context-menu
• [ ] data-table
• [ ] date-picker
• [ ] dialog
• [ ] dropdown-menu
• [ ] hover-card
• [ ] input
• [ ] label
• [ ] menubar
• [ ] navigation-menu
• [ ] popover
• [ ] progress
• [ ] radio-group
• [ ] scroll-area
• [ ] select
• [ ] separator
• [ ] sheet
• [ ] skeleton
• [ ] slider
• [x] switch
• [ ] table
• [ ] tabs
• [ ] textarea
• [ ] toast
• [ ] toggle
• [ ] tooltip
• [ ] typography

What is the current behavior?

The api of the Helm component is very verbose and needs to use many components and directives. `

  Airplane mode
</label>`

Closes #

What is the new behavior?

The api of the helm part is now simplified. You only need to add the hlm-switch `

        Airplane mode
    </label>`

Does this PR introduce a breaking change?

• [x] Yes
• [ ] No

When using the helm component you have to change the api from:

<brn-switch hlm>
   <brn-switch-thumb hlm />
</brn-switch>

to:

 <hlm-switch />

you have to replace the brn component with the hlm-component.

Other information

[elite-benni]

Additional "breaking change" is that we now use display contents, wich caused the Switch to be displayed without gap in the card example, the gap was added manually in the example.