feat: add support for binary UUID encoding in scan

[yash9263]

fixes: #3139

Adds support to read UUID via encoding.BinaryUnmarshaler.

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Note

Medium Risk
Changes hscan struct field scanning behavior to prefer encoding.BinaryUnmarshaler when present, which could affect existing types that implement multiple unmarshal interfaces. Impact is scoped to Redis hash/scan decoding paths but touches core decoding logic.

Overview
Adds support for scanning Redis hash values into struct fields that implement encoding.BinaryUnmarshaler, enabling binary UUID-style decoding during Scan/HGetAll().Scan().

Updates the hscan struct scanner dispatch in internal/hscan/structmap.go and adds coverage in both internal/hscan/hscan_test.go and commands_test.go to validate round-tripping a 16-byte ID via binary marshal/unmarshal.

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[ndyakov]

Hello @yash9263 , this would be a breaking change and we will look into including it in v10. Thank you!

[yash9263]

Hi @ndyakov, thanks for taking a look. Please let me know if any changes are needed to get it ready for v10.
Thanks!