update: add base notices entity, tests, and endpoint to do basic access

• update: add base notices entity, tests, and endpoint to do basic access

The data for this API was left unsecured as the expiration of an ECA document isn't sensitive information. In the future before launch, we can add authentication if we want to lock this data down.

This change doesn't add any filters or mechanisms to write the data outside of tests, as that will be taken care of in a later issue.

Resolves #10 (closed)