* Add GRN shared single layer test instance for CPU
* Remove GRN backend tests from fused_op.in
* Init GRN new template reference tests
* Add more bias values to GRN single layer tests
* Add more GRN template reference test cases
* Remove unused parameter from GrnParams
* Refactor GRN template referene tests and add more types
* Add anonymous namespace
* Add bf16 type to cpu single layer tests
* Add Serialization test
* Add GRN to revised ops