fix(rpcserver): normalized REST bytes base64 handling for path and query

[sergey3bv]

Should close #2075

[gemini-code-assist]

Summary of Changes

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This pull request improves the robustness of the REST API by standardizing how byte-based fields are parsed. By normalizing various base64 encoding formats, the API becomes more flexible for different client implementations. Additionally, it enforces stricter validation by returning explicit error responses for malformed input, preventing ambiguous or silent failures.

Highlights

• REST API Byte Normalization: Introduced a normalization layer for REST API byte fields (batch_key, asset_filter, group_key_filter, and group_key) to support multiple base64 variants (standard, URL-safe, with or without padding).
• Error Handling: Updated the API to return a 400 Bad Request status code for invalid base64 inputs instead of silently returning empty results.
• Middleware Integration: Implemented a new middleware and custom query parser to handle the normalization process consistently across both path and query parameters.

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[gemini-code-assist]

Code Review

This pull request introduces REST bytes normalization to support various base64 variants (standard, URL-safe, padded, and unpadded) for specific fields in both path and query parameters. It includes a new middleware and query parameter parser, along with comprehensive integration and unit tests. Feedback focuses on expanding the set of normalized fields, improving the reliability of path extraction, optimizing performance by reducing allocations, and ensuring all new functions adhere to the repository's documentation style guide.