Added v3 to module path (#2770)

* Added v3 to module path

This satisfies semantic versioning requirements of golang. See https://golang.org/cmd/go/#hdr-Module_compatibility_and_semantic_versioning

* Updated import paths to hit new version

Author: melinath

go.mod

@@ -1,4 +1,4 @@
-module github.com/hashicorp/terraform-provider-google-beta
+module github.com/hashicorp/terraform-provider-google-beta/v3
 
 require (
 	cloud.google.com/go/bigtable v1.5.0

google-beta/provider.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
-	"github.com/hashicorp/terraform-provider-google-beta/version"
+	"github.com/hashicorp/terraform-provider-google-beta/v3/version"
 
 	googleoauth "golang.org/x/oauth2/google"
 )

main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/plugin"
-	"github.com/hashicorp/terraform-provider-google-beta/google-beta"
+	"github.com/hashicorp/terraform-provider-google-beta/v3/google-beta"
 )
 
 func main() {