feat(dws): add new data source to query volumes of the logical cluster

[wuzhuanhong]

What this PR does / why we need it:

Add new data source to query volumes corresponding to logical cluster.

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.
2. add corresponding to document and acceptance test.

PR Checklist

• Tests added/passed.

make testacc TEST='./huaweicloud/services/acceptance/dws' TESTARGS='-run TestAccDataSourceLogicalClusterVolumes'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/dws -v -run TestAccDataSourceLogicalClusterVolumes -timeout 360m -parallel 4
=== RUN   TestAccDataSourceLogicalClusterVolumes_basic
=== PAUSE TestAccDataSourceLogicalClusterVolumes_basic
=== CONT  TestAccDataSourceLogicalClusterVolumes_basic
--- PASS: TestAccDataSourceLogicalClusterVolumes_basic (27.66s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/dws       27.717s

• 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 <<<<<<

[wuzhuanhong]

make testacc TEST='./huaweicloud/services/acceptance/dws' TESTARGS='-run TestAccDataSourceLogicalClusterVolumes_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/dws -v -run TestAccDataSourceLogicalClusterVolumes_basic -timeout 360m -parallel 4
=== RUN TestAccDataSourceLogicalClusterVolumes_basic
=== PAUSE TestAccDataSourceLogicalClusterVolumes_basic
=== CONT TestAccDataSourceLogicalClusterVolumes_basic
--- PASS: TestAccDataSourceLogicalClusterVolumes_basic (32.64s)
PASS
ok github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/dws 32.741s