Add support for `.eval()`

[netw0rkf10w]

Fixes https://github.com/mlcommons/algorithmic-efficiency/issues/758 and https://github.com/mlcommons/algorithmic-efficiency/issues/719

These two lines of code are sufficient to enable many extrapolation algorithms, including the weight averaging variants such as stochastic weight averaging, exponential moving average, schedule-free (cc @adefazio).

[github-actions[bot]]

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