Plug module for parsing cookie parameters and placing them into params.
init options
the plug initialization options are as follows:
[router_module, operation_id, parameters, plug_opts]
The router module is passed itself, the operation_id (as an atom),
a list of parameters maps from the OpenAPI schema, one for each cookie
parameter, and the plug_opts keyword list as elucidated by the router
compiler. Initialization will compile an optimized operations object
which is used to parse cookie parameters from the request.
conn output
The conn struct after calling this plug will have cookie parameters
declared in the OpenAPI schema placed into the params map. Cookie
parameters not declared in the OpenAPI schema are allowed.