Add support for highway=bridleway to a future version of the schema

[SomeoneElseOSM]

Taginfo links to usage:
https://taginfo.openstreetmap.org/keys/highway#values
(currently 298M)

https://taginfo.openstreetmap.org/tags/highway=bridleway
(currently 122k)

Examples in OSM
https://www.openstreetmap.org/#map=17/53.743064/-1.671381&layers=S
(without data)

https://www.openstreetmap.org/way/129253057#map=17/53.743064/-1.670845&layers=SD
(with data)

[Nakaner]

I support this request. I wrote the list of highway values to include back then and I forgot bridleway.

This can be added in 1.1 because it is not a breaking change.