Create data sources for tag_keys and tag_values (#6042) (#717)

* Created branch tag-data-sources from main

* initial commit of data sources for IAM tags

* Tests for tags data sources

* Added documentation

* Making error messages better

Signed-off-by: Modular Magician <magic-modules@google.com>

go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/hashicorp/go-cleanhttp v0.5.2
 	github.com/hashicorp/terraform-json v0.13.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.10.1
-	github.com/hashicorp/terraform-provider-google v1.20.1-0.20220523220620-f829613b65d6
+	github.com/hashicorp/terraform-provider-google v1.20.1-0.20220524082644-81d8e281f874
 	github.com/kr/pretty v0.3.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/onsi/gomega v1.17.0 // indirect

go.sum

@@ -703,8 +703,8 @@ github.com/hashicorp/terraform-plugin-log v0.2.0 h1:rjflRuBqCnSk3UHOR25MP1G5BDLK
 github.com/hashicorp/terraform-plugin-log v0.2.0/go.mod h1:E1kJmapEHzqu1x6M++gjvhzM2yMQNXPVWZRCB8sgYjg=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.10.1 h1:B9AocC+dxrCqcf4vVhztIkSkt3gpRjUkEka8AmZWGlQ=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.10.1/go.mod h1:FjM9DXWfP0w/AeOtJoSKHBZ01LqmaO6uP4bXhv3fekw=
-github.com/hashicorp/terraform-provider-google v1.20.1-0.20220523220620-f829613b65d6 h1:yXZ1gcjhRgyKUZd0u52y7eOltm/uo3mz5ekKaeKfP5g=
-github.com/hashicorp/terraform-provider-google v1.20.1-0.20220523220620-f829613b65d6/go.mod h1:j3C317ieF2X8MaHzA3jCdIL1DlAQsu9Hw/f09olZ+a4=
+github.com/hashicorp/terraform-provider-google v1.20.1-0.20220524082644-81d8e281f874 h1:N2ccZAr8zCJ0tBg183UCh3MdV2V6hZWfUz7XjezHA2Y=
+github.com/hashicorp/terraform-provider-google v1.20.1-0.20220524082644-81d8e281f874/go.mod h1:j3C317ieF2X8MaHzA3jCdIL1DlAQsu9Hw/f09olZ+a4=
 github.com/hashicorp/terraform-registry-address v0.0.0-20210412075316-9b2996cce896 h1:1FGtlkJw87UsTMg5s8jrekrHmUPUJaMcu6ELiVhQrNw=
 github.com/hashicorp/terraform-registry-address v0.0.0-20210412075316-9b2996cce896/go.mod h1:bzBPnUIkI0RxauU8Dqo+2KrZZ28Cf48s8V6IHt3p4co=
 github.com/hashicorp/terraform-svchost v0.0.0-20200729002733-f050f53b9734 h1:HKLsbzeOsfXmKNpr3GiT18XAblV0BjCbzL8KQAMZGa0=