Rename zrpc to rpc

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/rpc/build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    let mut build = prost_build::Config::new();
+    // build.protoc_arg("--experimental_allow_proto3_optional");
+    build
+        .compile_protos(&["proto/zed.proto"], &["proto"])
+        .unwrap();
+}