New Feature: make Mapillary Objects addable!

[Bonkles]

This issue will cover the first phase of getting mapillary objects added to OSM.

This issue re-incorporates the work done by @Muhammad and @hieule21 during the Q1 cohort of Major League Hacking here at Meta's Maps Geo team.

(The reason this work hadn't landed yet is that we were busy working on the Rapid 2.0 rewrite, and deferred getting this work in till that was successfully released).

So this issue will wrap up several suboordinate issues that will all be linked here in the description:

(TBD)