add external API connection for sending report of billables

[donrestarone]

trafficstars

Is your feature request related to a problem? Please describe.

We introduced the time tracker (timesheet app) in 0.9.77: https://github.com/restarone/violet_rails/releases/tag/0.9.77

We want to add a feature to see a daily report of billables per client, that shows on a per customer basis

1. total hours billed week to date (beginning of the week to run date)
2. total hours billed month to date (beginning of the month to run date)
3. total hours billed today with breakdown of tasks

Implementation plan

Develop an external API Connection that runs daily and sends the email to a list of emails that are injected via Metadata (so this list can be updated easily)

The shape of the API Namespace

Examples

using metadata to set variables for the execution context:

PR that introduced the time tracker app: https://github.com/restarone/violet_rails/releases/tag/0.9.77

[donrestarone]

inspired by

Copper CRM: https://prosperworks.slack.com/archives/C03A6TATJGJ/p1680802330542759?thread_ts=1680793208.374589&cid=C03A6TATJGJ

Forthspace Inc: https://mail.google.com/mail/u/1/#search/roger/FMfcgzGsltJTFpVBsRblGjtGgwxjlLzl

[donrestarone]

Pull request: https://github.com/restarone/violet_rails/pull/1521

Billable report Plugin documentation: https://github.com/restarone/violet_rails/issues/1538

How to create a Violet Plugin: https://github.com/restarone/violet_rails/issues/1539