THRIFT-5358: Add go.mod file to root directory

Client: go

This unblocks the development under go 1.16+, which starts to complain
when there's no go.mod file in any of the directories.

The current approach is certainly not the best solution ever, for
example it does not run the tests under lib/go/test/tests but copy them
into lib/go/test/gopath/src/sometest and run them there instead, but
those improvements can be done in the future in follow up PRs and this
should be a good enough first step to unblock developments.
diff --git a/test/go/src/common/simple_handler.go b/test/go/src/common/simple_handler.go
index 0c9463d..971f17e 100644
--- a/test/go/src/common/simple_handler.go
+++ b/test/go/src/common/simple_handler.go
@@ -21,8 +21,9 @@
 
 import (
 	"errors"
-	. "gen/thrifttest"
 	"time"
+
+	. "github.com/apache/thrift/test/go/src/gen/thrifttest"
 )
 
 var SimpleHandler = &simpleHandler{}
@@ -96,8 +97,8 @@
 func (p *simpleHandler) TestMapMap(hello int32) (r map[int32]map[int32]int32, err error) {
 
 	r = map[int32]map[int32]int32{
-		-4: map[int32]int32{-4: -4, -3: -3, -2: -2, -1: -1},
-		4:  map[int32]int32{4: 4, 3: 3, 2: 2, 1: 1},
+		-4: {-4: -4, -3: -3, -2: -2, -1: -1},
+		4:  {4: 4, 3: 3, 2: 2, 1: 1},
 	}
 	return
 }