print hashes as strings always

[sneakers-the-rat]

previously, the 'print' encoding of hashes as strings was only true of some places where hashes were used.

this change puts it directly into the serialization of the hash, which should be more controllable and predictable, since we should not have special behavior for hashes in some places but not others.

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📚 Documentation preview 📚: https://torrent-models--14.org.readthedocs.build/en/14/