Simplify ChaCha20 Poly1305 implementation #2338
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similar change to
https://github.com/esphome/aioesphomeapi/blob/c9227edf7fcee0f175c9f31c024ba71b0a0fac26/aioesphomeapi/_frame_helper/noise.py#L31
https://github.com/ikalchev/HAP-python/blob/dev/pyhap/hap_crypto.py#L17
pack
is a bit faster thanto_bytes