Map controls zoom

[PaulioRandall]

What does this change?

Adds map zoom buttons.

Why?

So users can zoom in and out of maps.

How?

Related issues:

None.

Does this introduce new dependencies?

No.

How is it tested?

Storybook and in a demo map.

How is it documented?

Storybook.

Are light and dark themes considered?

Yes.

• [x ] Have you included changeset file?
• [ x] If this adds a new component, is it exported via index.js?