[util] export Data() and Size() for TStringBuf in string.pxd.
@@ -5,6 +5,8 @@ cdef extern from "<util/generic/strbuf.h>" nogil:
cdef cppclass TStringBuf:
TStringBuf() except +
TStringBuf(const char*) except +
+ char* Data()
+ size_t Size()
cdef extern from "<util/generic/string.h>" nogil:
