feat: lex-sort query args and arg transformer hook

[rhnvrm]

This commit introduces a new feature that enables the specification of specific query parameters to be used as the cache index key when creating a URI via a arg transformer hook.

For instance, it allows caching requests like GET /foo?mode=bar. The assumption is that users are aware of the query parameters that can be sent and that these parameters are utilized by the handler to modify the request. Consequently, even if the user includes additional irrelevant parameters like GET /foo?mode=bar&junk=xyz, the cache will still be utilized since the specified parameters are the key.

Also, we now lexicographically sort the query params so that cache cannot be busted by reordering the params.