Internal usage of `find_spec` results in unexpected import of parent packages

[masenf]

Describe the bug

Reflex needs to replace the use of find_spec, because importing parent of the app module could result in importing the app module itself if the parent imports the app module as well:

To Reproduce

app/__init__.py

from .app import app

REFLEX_USE_GRANIAN=1 reflex run

• Python Version: 3
• Reflex Version: 0.7.14

[linear]

ENG-6378 Internal usage of `find_spec` results in unexpected import of parent packages