[WIP] Error logging callback

[bmosaicml]

What does this PR do?

This PR adds a callback that logs ICL outputs during eval. It modifies the custom metrics to keep track of incorrect model outputs. Each metric is responsible for specifying the table schema for logging cached responses as well as specifying how to format the cached responses using the tokenizer.

The EvalOutputLogging callback is then responsible for logging the cached results in table format after each evaluation.

Design doc

What issue(s) does this change relate to?

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