refactor(CFW): modify the type of the filter field that valid values contain zero value

[profoundwu]

What this PR does / why we need it:
modify the type of the filter field that valid values contain zero value
Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

1. modify the type of address_type from int to string
2. modify the type of ref_count from int to string

PR Checklist

• Tests added/passed.
• Documentation updated.
• Schema updated.

Acceptance Steps Performed

make testacc TEST="./huaweicloud/services/acceptance/cfw" TESTARGS="-run TestAccDataSourceCfwDomainNameGroups_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cfw -v -run TestAccDataSourceCfwDomainNameGroups_basic -timeout 360m -parallel 4
=== RUN   TestAccDataSourceCfwDomainNameGroups_basic
=== PAUSE TestAccDataSourceCfwDomainNameGroups_basic
=== CONT  TestAccDataSourceCfwDomainNameGroups_basic
--- PASS: TestAccDataSourceCfwDomainNameGroups_basic (639.82s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cfw       639.867s

make testacc TEST="./huaweicloud/services/acceptance/cfw" TESTARGS="-run TestAccDataSourceCfwAddressGroups_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cfw -v -run TestAccDataSourceCfwAddressGroups_basic -timeout 360m -parallel 4
=== RUN   TestAccDataSourceCfwAddressGroups_basic
=== PAUSE TestAccDataSourceCfwAddressGroups_basic
=== CONT  TestAccDataSourceCfwAddressGroups_basic
--- PASS: TestAccDataSourceCfwAddressGroups_basic (64.50s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cfw       64.552s

[houpeng80]

/lgtm

[Jason-Zhang9309]

/approve

[github-ci-robot]

This PR has been approved by: @Jason-Zhang9309

/approve