Feature/props on form elements

[kajsaeggum]

Describe your changes

• Added properties to MdInput for type=number: min, max and step for controlling allowed data. And adjusted type of value-property.
• Added forwardRef to MdMultiSelect to be able to reference it from outside and focus on it, just like the other form components. (Nothing else is changed even though it looks like it in the diff-view of github)
• Also fixed error in focus trap on MdModal when there are disabled elements in the modal

Checklist before requesting a review

• I have performed a self-review and test of my code
• 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?

[aurorascharff]

Må oppdatere branchen fra main og bumpe version pånytt etterpå.