Split packages into git repositories

[chris-martin]

Keeping everything in one repo was sort of expedient for starting to break up the freckle-app package, but it's time to start pulling them out.

• https://github.com/freckle/persistent-sql-lifted
• freckle-env
• freckle-exception
• freckle-http
• freckle-kafka
• freckle-memcached
• freckle-otel
• freckle-prelude