feat: Add additional /api/v1 routing for endpoints (#1511)

This adds /api/v1 routing for all current secure endpoints. This leaves
both sets of routing usable in in the openapi schema, but marks the ones
without the prefix with a deprecation tag. This gives us a step towards
having a versioned api while not introducing any breaking changes.
Having an api behind a version prefix affords us flexibility going
forward to add and migrate to new features with fewer issues.

Author: abbiemery