Implement custom radiobuttons + choicelist component

[jorisleker]

In #292 and #357 we implemented custom styling for checkboxes. Mainly to be able to show an error/invalid state. We still use default browser radio buttons, which leads to some design inconsistencies and issues with styling of focus states.

In Figma, all instances of radio groups have been replaced by a new custom styled radio-component.
Part of this ticket is to also implement the parent/container element of the checkbox/radio input's: the choice list, which defines spacing between and around groups of checkboxes/radio's.

Links to design

1. Radio component
2. Choice list component
3. Instance of choice list as currently used

Scope of ticket:

• implement custom styling of radio button
• implement choice list
• check codebase for places where input type=radio and input type=checkbox are used and implement custom element + choicelist container (radio: in recounted step, checkbox: used to accept warnings).
• make sure radio group behaviour works