query parameter name decoding middleware for ruby

[baywet]

depends on #1650

Due to conflicting standard requirement between RFC 6370 (uri template) and OData, we've had to encode query parameter names (%24select instead of $select) which means the service won't understand them.

To fix for that, once we have a middleware pipeline for the http client, we should implement a handler to decode the query parameter names.

See the example