gzip encoding is not be enabled by RequestEncodingHandler$Builder

RequestEncodingHandler$Builder enables deflate encoding but it does not enable gzip encoding.

Also, RequestEncodingHandler$Builder is not defined in a provider configuration file (core/src/main/resources/META-INF/services/io.undertow.server.handlers.builder.HandlerBuilder), so the handler can not be enabled through this HandlerBuilder.

In addition, I would like to suggest to rename the name of the handler builder "uncompress" to a more appropriate one "uncompress-request". As the handler builder is not defined in the provider configuration (= it has never been enabled by using the handler builder name), I think this name change does not break compatibility.