security/py-keepkey: Fix Python 3 and protobuf compatibilityHEADmain

Regenerate protobuf modules at build time to fix import failures with
current protobuf. Use the device-protocol revision matching upstream
7.2.1, which includes the required Tendermint definitions.

Fix Python 2 remnants in keepkeyctl and protobuf_json, and support
the protobuf descriptor API changes. Remove the unused exchange
module, which depends on the obsolete protobuf3 library.

Switch to PEP 517, correct the package version metadata, add the
python category, and expand the port description. Bump PORTREVISION.

PR:		300278

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