Add QUERY as a HTTP method type used for patch subset.

[garretrieger]

QUERY is a proposed new HTTP method type that is ideal for use in patch subset as it allows for a binary message body to be included while maintaining the cacheability and semantics of a GET request. This would allow us to avoid the use of POST requests.

QUERY is still a draft so we may have to wait for it to be finalized before fully depending on it in our specification. This issue is to track the addition of QUERY to the IFT spec once the QUERY spec is finalized.

In the meantime there are a a few questions about query that would be good to clarify:

1. Will range-requests work with QUERY? currently range requests are defined to only work with GET requests.
2. Will QUERY be considered a simple request and be exempt from CORS pre-flight requirements (this will likely need to be defined in the fetch specification).

[garretrieger]

This is no longer relevant with the specification rewrite that only uses GET.