DelegatorsParam: adds basic parameter, tests, and documenatation

More work is still needed here to finish out the spec, mainly
 in enforcing some validations. Check the todo's for the bulk of
 it.

tl;dr: I've been up for more than 24 hours and need to go to bed,
    so here's my commit of progress :)

Signed-off-by: Mark Stenglein <mark@stengle.in>
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