Feature: Add support to show locator in dashlets.

Currently, the locator feature is not part of the main "Maps" package as it relies on a third-party service (OpenStreetMap).

As it was created as a test/demo on implementing some custom functionality in the map's toolbar, it's original intention was to be a helpful tool while editing a single object. In this case, it creates or updates the single feature in the vector layer with the coordinates of a match (point or center of a line or polygon) when a result is found.

However, in the current version there is no check if the object is actually being edited. That needs to be addressed as well.

When bulk-editing, the geometry field is still visible as it's the only way to set coordinates. There's no hook here to add a map.

Additionally, because it was originally meant as a tool to assist while editing; the dashlet doesn't have the locator. However, the locator might be useful to zoom in on an area and see which features are there.

So the behavior should change:

• Detail view: only enabled when editing.
• Dashlet: add support to pan to the found coordinates (Perhaps zoom? But maybe better to let this to the user?)

When editing an object and using the locator, by default it creates or updates the existing feature to a point feature with the discovered coordinates.

The locator tool should:

• If a different type is returned in OSM (for example a line or polygon): Center to the point.
• Else: Just center.

Only when editing: the feature will be created or updated only if it matches the currently selected feature type.