specs: type AppDryRunInfo _cfg

[d4l3k]

Description

We currently have TypedDict typings for all of the scheduler configs. We should update AppDryRunInfo to use that instead of the generic Mapping[str, CfgVal] types. This should help cleanup the ytpe asserts/gets we do and improve safety since pyre will actually type those values.

torchx/torchx/specs/api.py

Line 514 in 42e9b44

self._cfg: Mapping[str, CfgVal] = {}

This is follow up work to T117253858

#482