feat: Speed Up Enthistory Codegen With Concurrency

[frisbm]

Description

Small bit of optimization on codegen speed, turns out the slowest part of the enthistory codegen is actually the imports correction in the print func. A very recent issue was opened in the go repo explaining this exact issue with the imports formatting - especially in regard to ent.

golang/go#66802

Motivation and Context

enthistory & ent codegen seemed to slow down after the rewrite

How Has This Been Tested?

Done some general testing, seeing anywhere from 10%-30% improvements depending on the size of the project
Otherwise this is a non functional changeset with no outcomes on downstream users

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update or addition to documentation for this project)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[philip-peterson]

@frisbm Great to hear there are more people with interest in the upstream cause. If you'd like to join forces it would be great. :) I do have a PR to implement a fix but it's blocked on a few things, could use a little support if you have extra time.