feat(sfs/turbos): add new data source support

[Lance52259]

What this PR does / why we need it: The SFS service is missing the turbo 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:

1. add new data source support.
2. add related document and acc test.

PR Checklist

• [x] Tests added/passed.
• [x] Documentation updated.
• [x] Schema updated.

Acceptance Steps Performed

make testacc TEST='./huaweicloud/services/acceptance/sfs' TESTARGS='-run=TestAccTurbosDataSource_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/sfs -v -run=TestAccTurbosDataSource_basic -timeout 360m -parallel 4
=== RUN   TestAccTurbosDataSource_basic
=== PAUSE TestAccTurbosDataSource_basic
=== CONT  TestAccTurbosDataSource_basic
--- PASS: TestAccTurbosDataSource_basic (425.65s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/sfs       425.717s

[Jason-Zhang9309]

/lgtm

[ShiChangkuo]

/lgtm