User-created basemaps

[annehaley]

This PR does the following:

• Create new model Basemap and a set of default objects that are created during migration
• Make client map creation/handling more abstract to allow switching basemap styles
• Add a menu to the controls bar for users to select a basemap
• Add a "New" button to the bottom of the basemaps menu which opens a dialog for creating a new basemaps
• In the basemap creation dialog, allow the user to specify the basemap with a tile URL or a style JSON

The following video demonstrates the new functionality:
https://drive.google.com/file/d/16pZCFmvi6-MuEhlnG6yqLWOy3wcJBSKl/view?usp=sharing

Resolves #240.

[cloudflare-workers-and-pages]

Deploying geoinsight with    Cloudflare Pages

Latest commit:	f77b94a
Status:	✅  Deploy successful!
Preview URL:	https://4f4098e7.geoinsight.pages.dev
Branch Preview URL:	https://base-maps.geoinsight.pages.dev

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[BryonLewis]

I haven't had time yet to run branch in geoinsight. I've only looked through the PR.
The only comment I feel is strongly reccomended is the one for guarding against adding bad styles into the list (testing and verification through the preview). Other than that one all others can be marked as suggestions and feel free to push back on any of them.
Tomorrow I'll go a bit more into detail and test the branch but I don't think I would have much else.

[BryonLewis]

I've run through it this morning and it works great. The only other very minor suggestion is maybe moving the '+ New' from the bottom of the list to the heading or top where it has 'Base Map Options'. Just so you don't have to scroll to get to the adding new button.

[annehaley]

The only other very minor suggestion is maybe moving the '+ New' from the bottom of the list to the heading or top where it has 'Base Map Options'. Just so you don't have to scroll to get to the adding new button.

Moved to the top of the basemaps list in f77b94a. I also updated the text and color to match the "+ Create Custom Colormap" button we have in the colormaps list

[BryonLewis]

👍