Path to EvaluationRow deprecation

[hannahilea]

Once #69 lands (via #70), the next piece is to refactor out the individual plotting components in relation to their given *MetricsRow---and then we can get rid of EvaluationRow, which combines multiple unrelated metrics types in a confusing (and easy to misinterpret) way.

(Ref brief discussion in #70 (comment))

Tasks:

• Replace evaluation_metrics_plot with per-schema plots that take in a table of the relevant metrics row
• Remove EvaluationRow and remove evaluation_metrics_row