Auth: Allow enabling/disabling protocols

[reinkrul]

Currently, we support:

• vp_bearer grant type (enabled by default)
• OpenID4VP (when AUTHORZATION_ENDPOINT_ENABLED = true)
• OpenID4VCI (client) (when AUTHORZATION_ENDPOINT_ENABLED = true)
• Authorization Code Flow when OpenID4VP is enabled

Upcoming support:

• JWT bearer grant type

Since we have an actual use case for OpenID4VCI, but not for OpenID4VP, we should allow enabling the OpenID4VCI without enabling OpenID4VP at the same time.

Configuration structure:

auth.openid4vp.enabled (true/false)
auth.openid4vci.enabled (true/false)

We can then add sub-configuration items in the future.