Add support for OIDC Identity Provider

[matiasah]

Is your feature request related to a problem? Please describe.
None.

Describe the solution you'd like

• Secure service-to-service authentication using the HashiCorp Vault OIDC Identity Provider.
• Generate tokens using the OIDC Identity Provider.
• Automatically renew the OIDC tokens before they expire.

Describe alternatives you've considered
None.

Additional context
https://developer.hashicorp.com/vault/docs/secrets/identity/oidc-provider

[mp911de]

Requires spring-projects/spring-vault#759 to be solved first.

[alturkovic]

Requires spring-projects/spring-vault#759 to be solved first.

The linked issue has a comment saying that this issue is a duplicate of 689 which has been closed (JWT support has been implemented).

Is this ticket solvable now? If it is, would it be possible to get a rough estimation on when this is planned?

[mp911de]

No not is not. I have little oversight over OIDC and what else belongs into this auth scheme as I'm not a user of OIDC. Therefore, if someone who is familiar with these would like to contribute, contributions would be highly appreciated.