Misc types
Other than the main request/response types, this crate is also responsible
for any miscellaneous types used within monerod's RPC.
For example, the status field within many RPC responses is defined within
cuprate-rpc-types.
Types that aren't requests/responses but exist within request/response
types are also defined in this crate, such as the
Distribution
structure returned from the get_output_distribution method.