Reindexing FQNs should be performed at a configurable interval

[jakedoublev]

While it is useful to trigger FQN reindexing (updating the cache of known FQNs to attribute namespaces, definitions, values) via the platform binary, it is not very extensible:

1. assumes schema of opentdf
2. uses db connection directly read in from config instead of a service API
3. is not present on the CLI or at an API

The ideal approach is one that:

1. is a job can be triggered via API call invoked by the CLI
2. and/or can be triggered at an interval set in the config