[openstreetmap/openstreetmap-website] Add PWA geo protocol handler (PR #5736)

[Marwin Hochfelsner]

### Description
This PR adds a geo protocol handler in the web manifest and the functionality for parsing in mapParams.
We can't directly parse it as it arrives wrapped in `encodeURIComponent`,
`geo:48.410,12.060?z=9` would be handled as https://www.openstreetmap.org/?geouri=geo%3A48.410%2C12.060%3Fz%3D9
This also includes a heuristic zoom fallback based on the precision.
### How has this been tested?
With `navigator.registerProtocolHandler`, which can be included later to settle #1123 (I don't know where to put it).
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5736

-- Commit Summary --

  * Add PWA geo protocol handler

-- File Changes --

    M app/assets/favicons/manifest.json.erb (8)
    M app/assets/javascripts/osm.js.erb (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5736.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5736.diff

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