Databricks Plugin

[ameijer]

Is your feature request related to a problem? Please describe.
Develop a Databricks Plugin for OpenCost Plugins

Additional context
Databricks billable usage logs download API docs: https://docs.databricks.com/api/account/billableusage/download

Example PR with an implemented Plugin: #41
This issue qualifies for our bounty program, read more details here: https://www.opencost.io/blog/introducing-opencost-plugins

[KingParmenides]

Submitted a Databricks billing plugin for this bounty: #73

It implements the account billable usage download API, parses monthly CSV exports, filters usage into daily Custom Cost windows, supports configurable SKU unit prices for contract-specific costs, and includes mocked tests/build verification.

Bounty payout address: BTC 39Q34P8A7g375yqEr8buvNJkUbRgKfbKQZ