add protobuf transport and refactor to support (#24)

.just/proto.just

@@ -0,0 +1,37 @@
+set unstable := true
+
+justfile := justfile_directory() + "/.just/proto.just"
+
+[private]
+default:
+    @just --list --justfile {{ justfile }}
+
+[no-cd]
+[private]
+check:
+    #!/usr/bin/env sh
+    if ! command -v protoc > /dev/null 2>&1; then
+        echo "protoc is not installed. Please install protobuf-compiler"
+        exit 1
+    fi
+
+[private]
+fmt:
+    @just --fmt --justfile {{ justfile }}
+
+# Generate protobuf code for both Rust and Python
+[no-cd]
+gen:
+  @just proto rust
+  @just proto py
+
+# Generate protobuf code for Rust
+[no-cd]
+rust: check
+    cargo build -p djls-types
+
+# Generate protobuf code for Python
+[no-cd]
+py: check
+    protoc -I=proto --python_out=python/djls proto/*.proto
+