[oshdb-filter] filter tags by numerical values

[tyrasd]

(possible) syntax: key < value, key > value, …

example: lanes >= 2

to clarify:

• what selector should do if the tag is not present? intuitively, neither lanes >= 2 nor lanes < 2 should not match a building. but shouldn't the selectors be complementary i.e. lanes >= 2 or lanes < 2 should match everything (like lanes = 2 or lanes != 2 matches everything)?!

This issue was originally posted at GIScience/ohsome-api#65 and https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/libs/ohsome-filter/-/issues/12