Modified Backport of #4619

[nathaniel-may]

resolves #4569

Description

This commit defers the expensive function dump_graph to only be called in the event the value is going to be logged. Without this change, users always generate this expensive graph regardless of the value of the flag --log-cache-events.

This backport of #4619 is separate from the original commit so that we do not have to backport #4505 which introduced mashumaro as the internal serializer for the events module. In order to keep this backport simple, I implemented it by passing python functions as values and silencing mypy to get type checking to pass. All tests from the original commit have been backported and adapted to this strategy.

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change

[nathaniel-may]

Closing in favor of #4660