Track how time is spent during the different phases of a CLI command

[jonthysell]

Summary

Record the time spent in each "phase" of a CLI command so we can track what are the most expensive operations.

Motivation

Every time we implement features in a CLI command there's concern that it hurts the CLI's performance. Adding this information would help us scope our concern relative to the total time it takes for the command to complete.

Basic Example

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Open Questions

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