[Static Runtime] test case for staticRuntime::runAsync() API (#80407)
Summary:
- Python interface to call StaticRuntime::runAsync API
- creates a custom executor with execution on inter-op thread pool
- test cases for different async graph scenarios like multiple forks, nested forks, exception handling
Test Plan:
- local tests
buck test mode/opt caffe2/test:static_runtime
buck test mode/opt caffe2/benchmarks/static_runtime/fb:test_fb_operators
buck test mode/opt caffe2/benchmarks/static_runtime:static_runtime_cpptest
- OSS CI tests
Differential Revision: D37471859
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80407
Approved by: https://github.com/tenpercent
