Release v0.3.0

What's Changed

This release adds some of the initial ETL methods for data engineers to perform basic, standardised data movement.
See docs for details on usage!

• feat(etl): created starter pack for ETL by @mrjsj in #23
• chore: prepare to release 0.3.0 by @mrjsj in #24

Full Changelog: v0.2.0...v0.3.0