- update tests that were failing with new mypy check
- mypy_test runs mypy on all .py source files in tests
- mypy_ci runs mypy and mypy_test, mypy is for source i.e. hdk/ only
- add BaseTracer which will hold most of the boilerplate code
- add hnumpy with a bare NPTracer and tracing function
- update IR to be compatible with tracing helpers
- update test helper to properly check that graphs are equivalent
- add test tracing a simple addition
- rename common/data_types/helpers.py to .../dtypes_helpers.py to avoid
having too many files with the same name
- ignore missing type stubs in the default mypy command
- add a comfort Makefile target to get errors about missing mypy stubs
