Add aws_cognito_user resource

.changelog/19919.txt

@@ -0,0 +1,3 @@
+```release-note:new-resource
+aws_cognito_user
+```

internal/provider/provider.go

@@ -932,6 +932,7 @@ func Provider() *schema.Provider {
 			"aws_cognito_identity_provider":          cognitoidp.ResourceIdentityProvider(),
 			"aws_cognito_resource_server":            cognitoidp.ResourceResourceServer(),
 			"aws_cognito_user_group":                 cognitoidp.ResourceUserGroup(),
+			"aws_cognito_user":                       cognitoidp.ResourceUser(),
 			"aws_cognito_user_pool":                  cognitoidp.ResourceUserPool(),
 			"aws_cognito_user_pool_client":           cognitoidp.ResourceUserPoolClient(),
 			"aws_cognito_user_pool_domain":           cognitoidp.ResourceUserPoolDomain(),