Storage, CLI, client, and server scaffolding.

This Renkon still does not perform inference, but it provides:

• a fully fleshed out storage system
• CLI
• Arrow Flight compatible server/client supporting get and put of frames to/from csv/parquet/arrow.

What's Changed

• Sketch of server CLI and structure (plus more config) by @DylanLukes in #15
• Stubbed client/server CLI and classes. by @DylanLukes in #16
• Redesigned Registry, Storage, and Repository interfaces. by @DylanLukes in #19
• First draft of Apache Arrow Flight compatible renkon server by @DylanLukes in #21
• Fix failing tests on Windows by @DylanLukes in #23
• Revert "Fix failing tests on Windows (#23)" by @DylanLukes in #24
• Fix failing tests on Windows by @DylanLukes in #25
• Implement basic client/server with get/put commands. by @DylanLukes in #26

Full Changelog: v0.0.1a1...v0.0.2