v0.4.0

add: function_min_similarity to limit functions from embeddings
add: function_max_tokens, controls the max tokens functions definitions can use. Will drop functions once over the limit.
add: max_event_size: some functions can return a megs of data as an event. This can now be limited to a max number of bytes
chore: refactor event handling
chore: update readme
chore: update version to 0.4.0

Full Changelog: v0.3.1...v0.4.0