feat: support creating and calling custom functions with hashicorp/go-plugin

plugin-gosdk/plugin/debugtalk.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+
+	plugin "github.com/httprunner/hrp/plugin-gosdk"
+)
+
+func SumInt(args ...interface{}) (interface{}, error) {
+	var sum int
+	for _, arg := range args {
+		v, ok := arg.(int)
+		if !ok {
+			return nil, fmt.Errorf("unexpected type: %T", arg)
+		}
+		sum += v
+	}
+	return sum, nil
+}
+
+func ConcatenateString(args ...interface{}) (interface{}, error) {
+	var result string
+	for _, arg := range args {
+		v, ok := arg.(string)
+		if !ok {
+			return nil, fmt.Errorf("unexpected type: %T", arg)
+		}
+		result += v
+	}
+	return result, nil
+}
+
+// register functions and build to plugin binary
+func main() {
+	plugin.Register("sum_int", SumInt)
+	plugin.Register("concatenate_string", ConcatenateString)
+	plugin.Serve()
+}