Investigate deferred libraries on Web

[esDotDev]

Investigate the potential reductions in load time that could be had using deferred library loading

• google maps plugin might be a good candidate

For reference:

• https://dart.dev/language/libraries#lazily-loading-a-library
• https://docs.flutter.dev/perf/deferred-components#:~:text=Deferred%20loading%20is%20only%20performed,builds%20can%20still%20hot%20reload.
• https://medium.com/flutter/optimizing-performance-in-flutter-web-apps-with-tree-shaking-and-deferred-loading-535fbe3cd674