added the astFile to the FuncInfo returned by docgen.GetFuncInfo() #19
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I wrote https://github.com/go-chai/chai, which is an extension for chi that provides support for type safe http handlers via generics. This allows it to also provide swagger spec generation that automatically detects the request/response types, http methods and route paths.
In there I use docgen.GetFuncInfo(), but I also need the astFile which docgen uses internally but does not return. I think the astFile could be useful for other purposes as well and this PR implements that so that people like me don't have to keep a slightly modified copy of it.