Create a sprite sheet for map resource pins

[RNR1]

Pull Request

Change Summary

• Create a single SVG sprite sheet file to combine all resource marker icons
• Prefetch this sprite sheet at the index.html level so it's cached
• Create an Icon component that accesses SVG symbols from a sprite sheet
• Use the new Icon component in the ResourceMarker component to easily access the icons

Change Reason

There was too much complexity and performance issues for loading the map resource icons.
This approach results in fewer asset files, shorter load times, and no need to generate SVG components.

[AnilKumar3494]

maybe can make size 80 or 85 when active. This kinda makes my visual intuition satisfied.