Feature/migrate to esbuild

[maximegris]

Description

A quick implementation to migrate from webpack to esbuild.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have run tests (npm run test & npm run e2e) that prove my fix is effective or that my feature works

[FrancescoBorzi]

thanks for your input @maximegris , I was able to migrate my project as well: https://github.com/azerothcore/Keira3/pull/2997