add shorthand for `key=* and key!=no`

[tyrasd]

Many OSM keys can have a no value to explicit map the negated meaning of the thing represented by that key. For example oneway=no, wall=no, etc.

It is slightly cumbersome to write filters for those cases when involving the key=* wildcard, as one needs to include an extra … and key!=no to make the query do what is expected. See e.g. GIScience/ohsome-quality-api#1018. Maybe we should introduce a shorthand syntax for this?

Possible ideas for how it could look like in the query:

key=%

key=**

key=*!no

key is truthy

key in (!no)

key=+