Move estimate...savings to respective Strategy base classes

[paschai]

Differential Revision: D65831213

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65831213

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.25000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 95.67%. Comparing base (6e93124) to head (2bfcb7a).

Files with missing lines	Patch %	Lines
ax/early_stopping/strategies/base.py	66.66%	4 Missing ⚠️
ax/early_stopping/tests/test_strategies.py	85.71%	1 Missing ⚠️
ax/global_stopping/strategies/base.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3056      +/-   ##
==========================================
- Coverage   95.68%   95.67%   -0.01%     
==========================================
  Files         485      485              
  Lines       49297    49312      +15     
==========================================
+ Hits        47169    47180      +11     
- Misses       2128     2132       +4     

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