Log build phase times for dev builds

[irismoini]

↪️ Pull Request

This PR provides a summary of the total time spent in each build phase outputted at the end of the current CLIReporter output when ran with PARCEL_SHOW_PHASE_TIMES=true

Currently Parcel's CLIReporter outputs the build times and sizes of each bundles. Parcel's tracer allows users to query how much time is spent in each phase of the build, however users have to remember to run the build with the --trace flag or add shouldTrace Parcel options, upload the trace to Perfetto, and query the SQLite database for this basic information. The PR allows developers of Parcel easy access to this information by adding a new env variable PARCEL_SHOW_PHASE_TIMES.

💻 Examples

🚨 Test instructions

Tested by running a Jira build and seeing the information outputted to the console. Also tested by piping build output to a file (change isTTY). Tested on cached builds.

✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

[mischnic]

This additional output should be behind some flag, most people won't care about this and/or have only have small projects. As you said

The PR allows developers of Parcel

maybe some env variable (like the other "internal" PARCEL_DUMP_GRAPHVIZ)?