feat(workspace): add new data source to query service detail

[Lance52259]

What this PR does / why we need it:
Supports a new data source that used to query the service configuration.

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 service detail.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o workspace -f TestAccDataSourceService_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 TestAccDataSourceService_basic -timeout 360m -parallel 10
=== RUN   TestAccDataSourceService_basic
--- PASS: TestAccDataSourceService_basic (638.82s)
PASS
coverage: 6.5% of statements in ./huaweicloud/services/workspace
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 638.875s        coverage: 6.5% of statements in ./huaweicloud/services/workspace

• Documentation updated.
• Schema updated.
• CheckDeleted.

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @Lance52259

[deer-hang]

/lgtm