[Static Runtime] implementation of variadic grouped_accessor_async operation (#82680)
Summary:
- implementation of variadic variant for grouped_accessor_async operator in static runtime
- grouped_accessor_async operator makes the GA operator as non blocking
Reviewed By: mikeiovine
Differential Revision: D37531683
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82680
Approved by: https://github.com/tenpercent, https://github.com/mikeiovine
