post
https://api.qfp.quantnetwork.net/api/policies//versions
Adds an immutable version at max(versionNumber) + 1. content is
validated against the catalog for the policy's action.
The policy is not repointed: it keeps serving the version it
pointed at before, and executions keep running that one. Making the new
version live is a separate call to
PUT /api/policies/{policyId}/current-version.

