feat(util): add BodyExt::limited
          #123
        
          
      
                
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According to hyperium/hyper#3111 (comment) and hyperium/hyper#3111 (comment), it seems that the
BodyExttrait is supposed to have alimit()method.I couldn't find it, so I opened this PR. I also slightly changed its name to
limitedto maintain consistency with methods likeboxed.