[Feature Request] New CBR vault sdk supported

[Lance52259]

What this PR does / why we need it:
According to existing demands, it is now necessary to support CBR policy related interface functions.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged):

NONE

Special notes for your reviewer:

Release note:

1. new CBR vault sdk supported
2. new sdk test supported

Acceptance Steps Performed

go test -v -run Test
=== RUN   TestCreateV3VaultsMarshall
--- PASS: TestCreateV3VaultsMarshall (0.00s)
=== RUN   TestCreateV3Vault
--- PASS: TestCreateV3Vault (0.00s)
=== RUN   TestGetV3Vault
--- PASS: TestGetV3Vault (0.00s)
=== RUN   TestUpdateV3Vault
--- PASS: TestUpdateV3Vault (0.00s)
=== RUN   TestDeleteV3Vault
--- PASS: TestDeleteV3Vault (0.00s)
=== RUN   TestListV3Vault
--- PASS: TestListV3Vault (0.00s)
=== RUN   TestPolicyBindingV3Vault
--- PASS: TestPolicyBindingV3Vault (0.00s)
=== RUN   TestPolicyUnbindingV3Vault
--- PASS: TestPolicyUnbindingV3Vault (0.00s)
=== RUN   TestAssociateResourcesV3Vault
--- PASS: TestAssociateResourcesV3Vault (0.00s)
=== RUN   TestDissociateResourcesV3Vault
--- PASS: TestDissociateResourcesV3Vault (0.00s)
PASS
ok      github.com/huaweicloud/golangsdk/openstack/cbr/v3/vaults/testing        0.021s

[coveralls]

Pull Request Test Coverage Report for Build 1287

• 141 of 174 (81.03%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 68.423%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
openstack/cbr/v3/vaults/urls.go	18	21	85.71%
openstack/cbr/v3/vaults/results.go	44	52	84.62%
openstack/cbr/v3/vaults/requests.go	79	101	78.22%

Totals
Change from base Build 1281:	0.1%
Covered Lines:	11870
Relevant Lines:	17348

---

💛 - Coveralls