refactor(api): Implement Input Validation for DA RPC Service

### Implementation ideas

The DA RPC service currently lacks input validation, posing a risk to the stability and security of the service. To enhance the robustness of the DA RPC service and protect against malformed or malicious inputs, it's crucial to implement thorough input validation mechanisms. This improvement will prevent unexpected behavior, crashes, and potential security vulnerabilities, ensuring that only valid and properly formatted data is processed.