add clone / insert methods
Summary: cursor.clone() will clone a length of the chain. insert(std::move(buf)) will splice in a length of chain I want this to change thrift2 binary type to IOBuf: we will clone() the network data for zero-copy userspace data, and insert() it if the return value is a IOBuf. Test Plan: added unittest Reviewed By: afrind@fb.com FB internal diff: D632073
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