[Feature] Update the report a sighting form to allow the user to select the location with a map

[eleanorscott97]

Description
As a user, I would like to be able to select the location of the whale sighting on a map

See https://developers.google.com/maps/documentation/javascript/examples/event-click-latlng for details

Acceptance Criteria
AC1: I can select a location on the map and the longitude and latitude fields of the form are filled out for me

[the-duckchild]

Have merged current main.