feat: Support for multiple rpc service generation and rpc grouping (#1972)

* Add group & compatible flag

* Add group & compatible flag

* Support for multiple rpc service generation and rpc grouping

* Support for multiple rpc service generation and rpc grouping

* Format code

* Format code

* Add comments

* Fix unit test

* Refactor function name

* Add example & Update grpc readme

* go mod tidy

* update mod

* update mod

tools/goctl/example/rpc/single_rpc_service_generate.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+wd=$(pwd)
+output="$wd/hello"
+
+rm -rf $output
+
+goctl rpc protoc -I $wd "$wd/hello.proto" --go_out="$output/pb" --go-grpc_out="$output/pb" --zrpc_out="$output" --multiple
+
+if [ $? -ne 0 ]; then
+    echo "Generate failed"
+    exit 1
+fi
+
+GOPROXY="https://goproxy.cn,direct" && go mod tidy
+
+if [ $? -ne 0 ]; then
+    echo "Tidy failed"
+    exit 1
+fi
+
+go test ./...