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

[Aaron Muir Hamilton]

Is this limitation documented for real anywhere? When you say "char" what exactly do you mean? Do you mean 255 UTF-8 bytes? libosmium says the strings can be up to 256 _four byte codepoints_, which is 1024 bytes of whatever you want. MySQL schema interpretation of varchar is different between versions, so can either mean 255 codepoints or 255 bytes of UTF-8.

It seems that people are further confused about this in the ecosystem, because https://github.com/MarcusWolschon/osmeditor4android/issues/1401 references this issue, but the "fix" they have only truncates values based on UTF-16 values, which will allow values larger than 255 UTF-8 bytes, but will fail on values 255 codepoints or fewer, when those codepoints are represented with a surrogate pair.

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