feat(shared-db): SerdeJsonOperator for json storage

[jonaro00]

No description provided.

[greptile-apps]

PR Summary

Introduces a new SerdeJsonOperator wrapper for PostgreSQL that adds JSON serialization/deserialization capabilities to OpenDAL storage operations.

• Added SerdeJsonOperator struct in /resources/shared-db/src/postgres.rs with methods read_serialized and write_serialized for JSON operations
• Implemented proper error handling by wrapping serde_json errors into opendal::Error types
• Added conditional export of SerdeJsonOperator in /resources/shared-db/src/lib.rs under the 'opendal-postgres' feature flag

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[greptile-apps]

PR Summary

(updates since last review)

Added Clone and Debug trait implementations to SerdeJsonOperator for improved developer experience and debugging capabilities.

• Added #[derive(Clone, Debug)] to SerdeJsonOperator struct in /resources/shared-db/src/postgres.rs
• Ensured proper trait bounds for the generic type parameter in SerdeJsonOperator's Clone implementation
• Improved error messages in JSON serialization/deserialization operations

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