feat(iotda/device_binding_groups): support device binding groups data source

[jinyangyang222]

What this PR does / why we need it:

Support device binding groups data source

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:

PR Checklist

• Tests added/passed.

$ export HW_IOTDA_ACCESS_ADDRESS=xxxxxxxxxxxxx

$ make testacc TEST="./huaweicloud/services/acceptance/iotda" TESTARGS="-run TestAccDataSourceDeviceBindingGroups_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/iotda -v -run TestAccDataSourceDeviceBindingGroups_basic -timeout 360m -parallel 4
=== RUN   TestAccDataSourceDeviceBindingGroups_basic
=== PAUSE TestAccDataSourceDeviceBindingGroups_basic
=== CONT  TestAccDataSourceDeviceBindingGroups_basic
--- PASS: TestAccDataSourceDeviceBindingGroups_basic (13.46s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/iotda     13.509s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

[jinyangyang222]

make testacc TEST="./huaweicloud/services/acceptance/iotda" TESTARGS="-run TestAccDataSourceDeviceBindingGroups_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/iotda -v -run TestAccDataSourceDeviceBindingGroups_basic -timeout 360m -parallel 4
=== RUN TestAccDataSourceDeviceBindingGroups_basic
=== PAUSE TestAccDataSourceDeviceBindingGroups_basic
=== CONT TestAccDataSourceDeviceBindingGroups_basic
--- PASS: TestAccDataSourceDeviceBindingGroups_basic (14.04s)
PASS
ok github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/iotda 14.085s

[deer-hang]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @deer-hang

/approve
/lgtm