[openstreetmap/openstreetmap-website] Increase may key and value max length (#2025)

[mmd]

>  it would be super to just increase the tagvalue length in the database to something like varchar(2000), bump the API minor version, and move on

That will for sure not work. There are lots of downstream data processors, and you need to look at this change end-to-end - starting with osmosis for the replication, tools like osmium that have string lengths restrictions and special size optimizations in place, many different editors assuming certain size limits, ...

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