Sketch based optimizer 4

[hmottestad]

GitHub issue resolved: #

Briefly describe the changes proposed in this PR:

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• I've added tests for the changes I made
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[kenwenzel]

@hmottestad Is this best used in combination with #5688 ?

[hmottestad]

@hmottestad Is this best used in combination with #5688 ?

This already incorporates the page walking estimator.