fix(golang): correct receiver type resolution in selector parsing

- Fix receiver type resolution by using m.Signature().Recv().Type() instead of sel.Recv()
- Add test case for struct method resolution

Author: wzekin

lang/golang/parser/file.go

@@ -371,7 +371,7 @@ func (p *GoParser) parseSelector(ctx *fileContext, expr *ast.SelectorExpr, infos
 		// callName := string(ctx.GetRawContent(expr))
 		// get receiver type name
 		// var rname string
-		rev := ctx.getTypeinfo(sel.Recv())
+		rev := ctx.getTypeinfo(m.Signature().Recv().Type())
 		// if rev == nil {
 		// 	rname = extractName(sel.Recv().String())
 		// } else {

testdata/go/0_golang/pkg/entity/entity.go

@@ -37,7 +37,11 @@ type InterfaceB interface {
 func (a MyStruct) String() string {
 	_ = a.Embed.MyStruct
 	_ = a.MyStructD
-	return "base struct"
+	return "base struct" + a.DFunction()
+}
+
+func (c MyStructD) DFunction() string {
+	return "I'm struct d function"
 }
 
 func (c MyStructC) String() string {