Flops profiler support einops.einsum (#6755)
- Added support for FlopsProfiler to include einops.einsum operation
- Added _patch_miscellaneous_operations() and
_reload_miscellaneous_operations() to include this operation and
potentially include other miscellaneous operations in the future
- Added _einops_einsum_flops_compute() that mimic already-existed
_einsum_flops_compute()
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Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>
