[Rector] Apply Option::PARALLEL to speed up analyze

[samsonasik]

Rector 0.12.10 has new Option::PARALLEL to speed up process, It now require Psr4 to be applied in tests to avoid Class was not found notice, ref rectorphp/rector#6903

Checklist:

• Securely signed commits

[samsonasik]

It works 🎉 Github uses 2 Core so its improvement is 2x faster.

Before: 5m5s, ref https://github.com/codeigniter4/CodeIgniter4/runs/4674999414?check_suite_focus=true#step:10:4

After: 2m36s, ref https://github.com/codeigniter4/CodeIgniter4/runs/4681175691?check_suite_focus=true#step:10:1

[samsonasik]

All green 🎉

[MGatner]

@samsonasik This is amazing! Thanks for being on top of all the latest.

Would you apply any relevant changes to https://github.com/codeigniter4/devkit?

[samsonasik]

@MGatner yes codeigniter4/devkit#4