feat(rocketmq): add new data source to get azs

[wuzhuanhong]

What this PR does / why we need it:
Add a new data source (huaweicloud_dms_rocketmq_availability_zones) to query availability zone list of the DMS rocketMQ under specified region.

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. add a new data source.
2. add corresponding documation and acceptance test.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o rocketmq -f TestAccDat
aRocketMQAvailabilityZones_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/rocketmq" -v -coverprofile="./huaweicloud/services/acceptance/rocketmq/rocketmq_coverage.cov" -coverpkg="./huaweicloud/services/rocketmq" -run TestAccDataRocketMQAvailabilityZones_basic -timeout 360m -parallel 10
=== RUN   TestAccDataRocketMQAvailabilityZones_basic
=== PAUSE TestAccDataRocketMQAvailabilityZones_basic
=== CONT  TestAccDataRocketMQAvailabilityZones_basic
--- PASS: TestAccDataRocketMQAvailabilityZones_basic (19.96s)
PASS
coverage: 5.4% of statements in ./huaweicloud/services/rocketmq
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/rocketmq  20.115s coverage: 5.4% of statements in ./huaweicloud/services/rocketmq

• 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 <<<<<<

[Lance52259]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @Lance52259

/approve
/lgtm