When re-building Flet extension app, changes are not included unless pip cache is cleared

[InesaFitsner]

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Describe the requested feature

1. Create flet extension app
2. Build
3. Make changes to python or dart files
4. Build and open app -> changes are not included
5. Clear cache, build and open app -> changes are included
   https://pip.pypa.io/en/stable/topics/caching/#locally-built-wheels

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[Muddassir-Farooq-official]

Also create a platform like pub dev flutter have so there should be an official platform for custom flet packages so community can grow