Added href to FAB buttons

[treeder]

The original one didn't have href attribute for a FAB for some reason and didn't plan on it. material-components/material-web#5358

This is now part of this library:

  <md-fab variant="primary" href="/abc">
    <md-icon slot="icon">add</md-icon>
  </md-fab>

[Shamimwn]

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