0.33.0

Replace the system concept with channel, which is a better abstraction for modelling how rngo simulations work.

Also remove the format keyword from effects, in favor of the more generic metadata.

See the blog post for more: https://rngo.dev/blog/release-friday/goodbye-systems-hello-channels

What's Changed

• Remove format from effect by @khyrngo in #33
• Replace system with channel by @khyrngo in #34

Full Changelog: 0.32.0...0.33.0