More advanced input suffix

[kajsaeggum]

Describe your changes

Expanded the type of the suffix-prop on MdInput, to be able to add an icon, or button there instead of just text. Specific use case that triggered the need for change is having an icon button for clearing the input:

Checklist before requesting a review

• [x] I have performed a self-review and test of my code
• [x] I have added label to the PR (major, minor or patch)
• [ ] If new component: Is story for component created in stories-folder?
• [ ] If new component: Is tsx-file import added to packages/react/index.tsx?
• [ ] If new component: Is css-file added to packages/css/index.css?

[github-actions[bot]]

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