Add train_inputs Option into qMVES

[wjmaddox]

Motivation

Not every gpytorch model will store the training inputs (e.g. SVGPs) so adding a training data option into qMVES allows usage for a wider variety of gpytorch models.

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

N/A.

Related PRs

None.

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[codecov]

Codecov Report

Merging #593 (1216260) into master (dc868cc) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #593   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           89        89           
  Lines         5771      5773    +2     
=========================================
+ Hits          5771      5773    +2     

Impacted Files	Coverage Δ
botorch/acquisition/max_value_entropy_search.py	100.00% <100.00%> (ø)

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[Balandat]

Probably a good pattern to follow more generally for other acquisition functions that may make this implicit assumption. For now this lgtm!

[facebook-github-bot]

@Balandat has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@Balandat merged this pull request in a04b50f.