Test and Document Vault provider support with Secret Store CSI driver operator

Feature Overview (aka. Goal Summary)

Current version of the SSCSI driver Operator from RedHat does not document support for the Vault provider. This feature will track the testing and documentation of Vault provider with RedHat's Secret Store CSI Driver Operator. 

Goals (aka. expected user outcomes)

Current version of the SSCSI driver Operator from RedHat does not document support for the Vault provider. This feature will track the testing and documentation of Vault provider.

NON-GOALS:

Operator is still offered as TechPreview and customers can use upstream Vault provider  (https://github.com/hashicorp/vault-csi-provider to test this solution for now. When we GA the SSCSI Operator, we expect HashiCorp to provide support for the Vault provider certified on RedHat OpenShift and associated Vault secret store used for integration under RedHat's 3rd party support as described https://access.redhat.com/third-party-software-support _

Requirements (aka. Acceptance Criteria):

A list of specific needs or objectives that a feature must deliver in order to be considered complete. Be sure to include nonfunctional requirements such as security, reliability, performance, maintainability, scalability, usability, etc. Initial completion during Refinement status.

Use Cases (Optional):

Include use case diagrams, main success scenarios, alternative flow scenarios. Initial completion during Refinement status.

Questions to Answer (Optional):

Include a list of refinement / architectural questions that may need to be answered before coding can begin. Initial completion during Refinement status.

Out of Scope

High-level list of items that are out of scope. Initial completion during Refinement status.

Background

Provide any additional context is needed to frame the feature. Initial completion during Refinement status.

Customer Considerations

Provide any additional customer-specific considerations that must be made when designing and delivering the Feature. Initial completion during Refinement status.

Documentation Considerations

Provide information that needs to be considered and planned so that documentation will meet customer needs. If the feature extends existing functionality, provide a link to its current documentation. Initial completion during Refinement status.

Interoperability Considerations

Which other projects, including ROSA/OSD/ARO, and versions in our portfolio does this feature impact? What interoperability test scenarios should be factored by the layered products? Initial completion during Refinement status.