[namedtensor] Add TensorNames::checkUnique, operator<< (TensorName) #29124
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Stack from ghstack:
TensorNames::checkUnique gives a nice error message if there are
duplicate names.
Adding operator<< on TensorName cleans up some code. A TensorName gets
printed out as: "'H' (index 2 of ['N', 'C', 'H', 'W'])" for example.
Test Plan:
build/bin/NamedTensor_test.Differential Revision: D18311868