Convert create_authors job to use API calls instead of DB access

[ZavenArra]

Logic is currently working in the job in sql, in lib/messaging.py

The job should also only create records for new grower accounts created in the last day.
The job should also take an optional parameter to bypass this time range and run across the entire set of grower accounts, when triggered as a manual job.

[ZavenArra]

from Dadior: https://github.com/Greenstand/treetracker-airflow-dags/blob/main/lib/earning_export.py I did some http request here copilot told me the lib 😁