rpc: implement set_log_level and set_log_categories handlers

[DanielBoye]

What

Implements the set_log_level and set_log_categories RPC endpoints that were previously marked with todo!(). These handlers allow dynamic adjustment of logging levels and categories via RPC, matching monerod's behavior.

Why

These endpoints are part of the standard Monero RPC API and enable dynamic log level adjustment without restarting the daemon, ensuring compatibility with existing Monero tooling.

Where

• binaries/cuprated/src/rpc/handlers/other_json.rs
  • Implemented set_log_level handler
  • Implemented set_log_categories handler
  • Updated request routing to call these handlers instead of not_available()

How

• set_log_level: Maps Monero log level numbers (0-4) to Rust's tracing::LevelFilter (ERROR, WARN, INFO, DEBUG, TRACE) following the monerod implementation. Updates both stdout and file logging filters.

• set_log_categories: Parses category strings in EnvFilter format (e.g., "*:INFO", "net:DEBUG") following the monerod implementation. Extracts the log level and applies it to both logging outputs, defaulting to INFO if parsing fails.

Both handlers follow existing code patterns and error handling conventions.