[Tagging] Parking lane tagging - city_parking_zone as extra condition value

[Mateusz Konieczny]

This can work with both just proposed tagging and existing one.

I also thought about municipal_parking_zone as value.

This idea relies on following assumptions

* it is useful to gather/tag info "this is a city parking zone" even if 
further info is not tagged immediately
* extra info can be added without on site survey (because it is often 
the same for entire city or the same in entire districts)
* tagging full info is often obnoxious and hard to maintain, while 
gathering it with one value would allow coordinated updates across city

Example from Kraków, Poland.

Area and subareas are well defined, but this rules apply only on public roads. 
See https://zdmk.krakow.pl/parkowanie/strefa-platnego-parkowania/mapy/mapa-strefy/
for an official map.

https://www.openstreetmap.org/way/414860799 is in A1 subarea but
city parking rules do not apply there as it is internal road 
of Jagiellonian University from legal viewpoint.

For https://www.openstreetmap.org/way/294128564 this parking rules apply.

This info is not obvious and requires survey/research.

Tagging full rules would require noting that
- parking is paid
- parking is free on Sundays and during night (from 20.00 to 10.00)
- charge strongly reduced for residents with long-term permits

The first two rules are (in case that new tagging would be accepted)

parking:condition:*=ticket
parking:condition:*:conditional=free @ (Su, Mo-Fr 20:00-10:00)

with the current tagging
parking:condition:*:ticket:time_interval=Mo-Fr 10:00-20:00
parking:condition:*:free:time_interval=Mo-Fr 20:00-10:00,Su

tagging this requires checking syntax on wiki (or dedicated editor),
checking exact parking rules on 
https://zdmk.krakow.pl/parkowanie/strefa-platnego-parkowania/informacje-ogolne-i-oplaty/ 
and inputting all of that for every single road segment with parkings.

Even with nice interface (I am working on one exactly right now) collecting
this info would be really obnoxious.

It seems to me that collecting just 
parking:condition:*=city_parking_zone during survey and later 
armchair adding
parking:condition:*:conditional=ticket; free @ (Su, Mo-Fr 20:00-10:00)
to all
parking:condition:*=city_parking_zone
would be better workflow.

There are also some minor benefits:
And also makes easier to handle changes in rules (Saturdays used to be also free)
And allows distinguishing between city-operated parking and privately operated
(residents may have paid parking only for the first one)

And negatives:
One more extra rule to suppport and understand.
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