Allow drawing colour and fill to be customisable

[benbaumann95]

Description of change

• In Bops, we want to be able to draw a polygon on the map to visualise a consultation area where we return the addresses in that drawn area. However, this is currently hardcoded in red and to distinguish between the red line boundary and consultation area we preferably want this in a different colour that can be customisable. This PR adds this ability.
• The drawingColor and drawingColorFill defaults to what we usually expect for the red line boundary

Trello ticket:
https://trello.com/c/IQsb3WNF/1908-improve-content-and-layout-for-querying-neighbour-addresses-by-polygon-search

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[jessicamcinchak]

Thanks for these changes, a very useful feature! Two minor comments, but otherwise looks great 🖍️

[jessicamcinchak]

Thanks for updating docs too ✨ I'd expect these new props to be added to docs/my-map-draw.doc.js rather than -features though please

[benbaumann95]

Oh yeah woopsie

[jessicamcinchak]

nit: can polygonVertices also be refactored as a small function that takes the drawingColor argument ? They're still hardcoded to red!

[jessicamcinchak]

Sorry two more minor tweaks that I just caught on final review!

Once adjusted, I'm happy to approve and merge this and make the release (limited permissions to that step because OSL NPM account) and share new version number with you for use 🎉 Thanks again for this!