title: How can you get a list of unrecognized JSON fields in Gson like Jackson's @JsonAnySetter?
body: <p>So I currently use the Jackson parser and its libraries in my android projects. However, looking at the method counts for jackson and gson has me pondering about making a move to gson. After looking through different methods/syntax etc. I have been unable to find a gson equivalent to Jackson's @JsonAnySetter or @JsonAnyGetter. </p>
  
  <p>Does this exist for gson? And if not, is there an work around?</p>