feat(workspace): add new data source to query time zones

[Lance52259]

What this PR does / why we need it:

Supports a new data source that used to query time zones.

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 new data source to query time zones

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o workspace -f TestAccDataSourceTimezones_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/workspace" -v -coverprofile="./huaweicloud/services/acceptance/workspace/workspace_coverage.cov" -coverpkg="./huaweicloud/services/workspace" -run TestAccDataSourceTimezones_basic -timeout 360m -parallel 10
=== RUN   TestAccDataSourceTimezones_basic
=== PAUSE TestAccDataSourceTimezones_basic
=== CONT  TestAccDataSourceTimezones_basic
--- PASS: TestAccDataSourceTimezones_basic (13.04s)
PASS
coverage: 3.0% of statements in ./huaweicloud/services/workspace
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 13.134s coverage: 3.0% of statements in ./huaweicloud/services/workspace

• 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 <<<<<<

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @Lance52259

[Zippo-Wang]

/lgtm