Move the option-types to the client and in some cases create a
copy for the backend. These types are used to construct query-
args, and not marshaled to JSON, and can be replaced with functional
options in the client.
The CreateOptions type was used both as options-struct for the client,
and as struct to marshal/unmarshal the request. For this type, a copy
is created in the Client and a new `checkpoint.CreateRequest` is added
in the API.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
a8afc2c6fb