Allow for viewing local geojson layers

[floryst]

Users can now visualize local geojson files in RD-WATCH.

Screen.Recording.2024-10-22.at.3.19.43.PM.webm

Nice-to-haves and other considerations:

• toggle layer visibility
• nicer layer names (based on what?)
• edit geometry styles
• should the annotator view also support viewing local geojsons?

Other changes:

• The map is no longer partially covered by the sidebar
• An event is used for triggering map.fitBounds() instead of a state variable
• minor whitespace changes that were automatically done by my editor

[BryonLewis]

Sorry about the delay in reviewing this, just a couple of suggestions.

As usual some future features not needed for this PR (mostly just thoughts):

• May be nice to integrate with tooltips and present a table of the properties for a feature, or perhaps selection and provides a table of the properties for the selected features. There could be metadata associated with their geometry that help distinguish items.