Automatic 'Content-Type' header inference for requests #11
Description
Currently, the Content-Type header for a type conforming to the APIotaCodableEndpoint protocol must be set explicitly.
The Content-Type header should be inferred automatically based on the content of the request itself. This header should be appended to the headers that are attached to the request generated as a result of the default implementation of the request(baseUrlComponents: URLComponents) throws -> URLRequest method on the APIotaCodableEndpoint protocol.