Add log_path to TorchXRunner

[ldworkin]

Summary: Currently we have to use a fixed parameter to specify "log_path" (see https://colab.research.google.com/drive/1kOKw5ddweQGmtyADoXfp-xoVdqvRBWV_?usp=sharing#scrollTo=kH0XT8nBJwkC). This way we'll be able to pass it to the TorchXRunner directly, which is more natural. See test plan in notebook.

Differential Revision: D33979622

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D33979622

[codecov[bot]]

Codecov Report

Merging #382 (656d9b5) into main (4b989d5) will decrease coverage by 0.02%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   94.70%   94.67%   -0.03%     
==========================================
  Files          63       63              
  Lines        3359     3362       +3     
==========================================
+ Hits         3181     3183       +2     
- Misses        178      179       +1     

Impacted Files	Coverage Δ
torchx/runtime/hpo/ax.py	94.20% <66.66%> (-1.26%)	:arrow_down:

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