feat(haproxy): add initial implementation for HAProxy log ingestion

rust/haproxy_ingest_proto/build.rs

@@ -0,0 +1,11 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let protoc = protoc_bin_vendored::protoc_bin_path()?;
+    unsafe {
+        std::env::set_var("PROTOC", protoc);
+    }
+    let mut config = prost_build::Config::new();
+    config.type_attribute(".haproxy.ingest.v1.LogBatch", "#[derive(Eq)]");
+    config.compile_protos(&["proto/haproxy_ingest.proto"], &["proto"])?;
+    println!("cargo:rerun-if-changed=proto/haproxy_ingest.proto");
+    Ok(())
+}