perf: Implement shorter and fixed size tokens
perf: Implement shorter and fixed size tokens

Tokens now only include the integer IDs of the relevant keys, not the
full encoded keys. This makes them smaller, fixed size (integer IDs are
all 64 bits) and maybe even faster.

coduno/api,flowlo/coduno-api,coduno/api,pbochis/api,flowlo/coduno-api,pbochis/api,pbochis/api,coduno/api,flowlo/coduno-api