[MPRIS] Support userRating setting

[George Hafiz]

Although *getting* userRating is implemented in the mpris-spec metadata (
https://gitlab.freedesktop.org/mpris/mpris-spec), there is no method for
setting it via
https://specifications.freedesktop.org/mpris-spec/2.2/Player_Interface.html.

I would like to propose the addition of a user rating setting method that
would enable players to receive a float/double of the desired user rating
and handle that accordingly.

For example, players that simply adopt liking or not (Spotify) might choose
to treat 0.0 as not liked and 1.0 as liked. Others with a star-ranking
system might map 0.0 to zero stars, 0.2 for one star, up to 1.0 for five
stars.

What is required for a formal proposal to change the spec from 2.2 to 2.3
in order to add this method to the mpris Player spec?
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