support tags for dds and dcs instance resource

[ShiChangkuo]

the testing result as follows:

$ make testacc TEST='./huaweicloud' TESTARGS='-run TestAccDDSV3Instance_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud -v -run TestAccDDSV3Instance_basic -timeout 360m
=== RUN   TestAccDDSV3Instance_basic
--- PASS: TestAccDDSV3Instance_basic (627.59s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud       627.652s

$ make testacc TEST='./huaweicloud' TESTARGS='-run TestAccDcsInstancesV1_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud -v -run TestAccDcsInstancesV1_basic -timeout 360m
=== RUN   TestAccDcsInstancesV1_basic
--- PASS: TestAccDcsInstancesV1_basic (355.48s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud       355.515s