Implement set_ methods

[mpolson64]

Summary: These methods are not strictly speaking "part of the API" but may be useful for developers and trusted partners. Each is fairly self explanatory.

Differential Revision: D66304352

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66304352

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.23729% with 17 lines in your changes missing coverage. Please review.

Project coverage is 95.74%. Comparing base (5d1e441) to head (6819cf3).

Files with missing lines	Patch %	Lines
ax/preview/api/client.py	68.75%	10 Missing :warning:
ax/preview/api/utils/instantiation/from_string.py	94.11%	4 Missing :warning:
ax/preview/api/utils/instantiation/from_config.py	94.23%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3101 +/- ## ========================================== + Coverage 95.41% 95.74% +0.32% ========================================== Files 495 500 +5 Lines 49941 50223 +282 ========================================== + Hits 47653 48085 +432 + Misses 2288 2138 -150 ```

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66304352