Inputs that expect an ID, should all be of the ID Type and should accept the Integer or Relay ID #109
Description
In various Input args, we're currently setup to accept the WordPress ID as the input, but we should be accepting Global Relay IDs.
For example, the where args for the posts query has an input of authorIn which accepts a list of Ints. . .this should accept a list of IDs and should parse out the WP ID from the Global ID.
Same goes for basically all inputs where the expected input is an ID
More examples, but not necessarily a comprehensive list
authorIn
authorNotIn
categoryAnd
categoryIn
in
notIn
parentIn
parentNotIn
tagAnd
tagIn
tagNotIn