feat(components): add post-button webcomponent

[Meierschlumpf]

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[gfellerph]

Thanks @Meierschlumpf for the initiative. Please mark the PR as ready for review when you're ready for the first feedback 🤓

[Meierschlumpf]

I've got two questions regarding the implementation:

1. How to deal with class names? should we just forward them? (Especially for the full width example)
2. How do we deal with buttons that are used as a tags or that are using custom components like Link in NextJS? Do we just not support them through this component as for example loading will not be necessary for links?