improve hot reload times in granian even more

[adhami3310]

we go down from ~100ms down to ~20ms by simply caching reflex.app module (and its deps)

[greptile-apps]

PR Summary

Optimizes hot reload performance in Granian backend by implementing module caching, resulting in significant latency reduction from ~100ms to ~20ms.

• Modified reflex/utils/exec.py to pre-import reflex.app module before Granian backend initialization, enabling module caching
• Implementation specifically targets backend reload time optimization through Python module cache utilization
• Change is minimally invasive but delivers ~80% improvement in hot reload responsiveness

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[codspeed-hq]

CodSpeed Performance Report

Merging #5499 will not alter performance

_{Comparing improve-hot-reload-times-in-granian-even-more (e9d115c) with main (e99dbe2)}

Summary

✅ 8 untouched benchmarks