Embedding Static Map to UploadWizard

Add a new class file mw.GeoMap.js to UploadWizard. Its object can embed
a static map – from OSM data – based on input coordinates.

This patch will be followed up by code to change coordinates via the map
and other project goals.

Bug: 56612
Change-Id: I87245f7119085f10e6b62f1e1a2c9d2db0af82c7