Update Rest client 4 Invoke-AzRest (Azure#186)

* add AzureRestenericOperations to return raw json response

* update class name

* constructor

* update azurerestgenericoperations

* remove generic operation

* fix type

* add IAzureRestOperationsExtention

* try remove serialize for payload

* support full response

* to return full response

* full response even when request failed

* remove commented code

* refactor code to reduce duplicate

* add comments to IAzureRestOperations

* serialize payload

* fix API names

* update API names

* deprecate old APIs

* update API names

* typo

Co-authored-by: Dingmeng Xue <[email protected]>

Author: VeryEarly