[torchx/config] Enable scheduler_params override to .torchxconfig

[kiukchung]

Description

Enable scheduler_params (these are ctor params to the scheduler objects NOT the run configs) to be set via .torchxconfig file.

Motivation/Background

we allow users to set default scheduler runcfg in .torchxconfig. See: https://pytorch.org/torchx/latest/experimental/runner.config.html. The ask is to also enable scheduler_params (see example: https://github.com/pytorch/torchx/blob/main/torchx/schedulers/local_scheduler.py#L925) via .torchxconfig.

Detailed Proposal

Add a section as [{scheduler_name}.params]:

[local_cwd.params]
cache_size = 10

Alternatives

N/A

Additional context/links

N/A