Enhance printing functionality with SNMP support and update dependencies

- Added SNMP configuration options to `AppConfig` for querying printer status.
- Extended `PrintInstruction` in the proto file to support additional fields for remote file URLs and raw data.
- Implemented logic in `CupsClient` to retrieve printer paper levels and page counts via SNMP.
- Updated `Cargo.toml` to include `snmp` and `reqwest` dependencies for network communication.
- Refactored `TempPdf` handling to support multiple data sources for printing.
- Improved error handling and logging for better diagnostics during print operations.

build.rs

@@ -4,6 +4,8 @@ fn main() {
         std::env::set_var("PROTOC", protoc);
     }
 
+    println!("cargo:rerun-if-changed=proto/control.proto");
+
     tonic_build::configure()
         .build_server(false)
         .compile(&["proto/control.proto"], &["proto"])