* prevent all name clashes by using a prefix for all parameters, this way they CANNOT clash with anything locally, as our hardcoded stuff in mustache files doesnt start with "p_" ,
when using the grouped option, we just use the params directly and dont unpack the variables at all, prevending furthur name clashes.
* get rid of "local_var" prefix, now that we no longer clash with paramater names
* fix a typo and remove the r# generated to the paramName when we create the identifier
* java code formatting and added a fake-endpoint parameter test
* update rust samples
* [rust][reqwest] support binary type for upload and download
* [rust][reqwest] support binary download in supportMultipleResponses contexts
* [rust][reqwest] support binary responses that don't have any return type
