Small api fixes

[Neopallium]

1. Add alias for enc_keys field.
2. Add SQLx support for AccountPublicKeys.

[Copilot]

Pull request overview

This PR introduces two small API/interop improvements in the BP module: it adds a Serde deserialization alias for AssetKeys::enc_keys and adds sqlx BLOB encoding/decoding support for AccountPublicKeys so it can be stored/loaded via SQLx-backed persistence.

Changes:

• Add Serde alias encKeys for the enc_keys field in AssetKeys.
• Add sqlx::Type, sqlx::Decode, and sqlx::Encode implementations for AccountPublicKeys using BLOB storage.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/bp/sqlx_impl.rs	Adds SQLx Type/Decode/Encode impls for AccountPublicKeys stored as a BLOB.
src/bp/asset.rs	Adds a Serde alias for AssetKeys::enc_keys to accept encKeys on deserialize.

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