Expose random_data #176
Description
The function is already implemented at https://github.com/jerusdp/mockd/blob/main/src/misc.rs#L9
It'd just be useful to expose it so users don't have to depend on simplerand in addition to mockd: I think it's a pretty often-recurring thing that's required to generate databases, to take a random id from a list of available ids.
WDYT?