[Tagging] seamark:bridge:clearance_height=no_indications

[DjTQnhSoc]

Hi everyone,

[Over on the StreetComplete GitHub page](https://github.com/streetcomplete/StreetComplete/issues/2929) we've been discussing support for seamark:bridge:clearance_height=* and associated tags. This tag concerns the space that ships have to pass under bridges. Often, there are signs next to bridges indicating to ships what this clearance is. One question we're facing is what to tag if there is no such indication of clearance. [Taginfo tells us](https://taginfo.openstreetmap.org/keys/seamark%3Abridge%3Aclearance_height#values)that "unknown" is used in practice in such cases, however, I suggest using "no_indications" for StreetComplete, similar to the ["maxheight" key](https://wiki.openstreetmap.org/wiki/Key:maxheight#Non-numerical_values), as it conveys more accurate information than "unknown" does. Neither "unknown" nor "no_indications" are currently mentioned on the relevant [wiki page](https://wiki.openstreetmap.org/wiki/Seamarks/Bridges#Clearances), and before introducing this value, we wanted to run it past this group for feedback. Bear in mind, this is not a suggestion to mechanically replace all "unknown" values with "no_indications", just a suggestion of a new value.

I'm looking forward to your feedback!

Kind regards,

Tomagori
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