flet create should use src directory layout and a create a tests folder

[asmaier]

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Describe the requested feature

At the moment flet create doesn't create a standard directory layout. It would be nice if it would follow the
standard src-directory layout as described at

• https://packaging.python.org/en/latest/discussions/src-layout-vs-flat-layout/
• https://docs.astral.sh/uv/concepts/projects/init/#packaged-applications
• https://python-poetry.org/docs/cli#new

So I suggest a dir layout like

❯ tree flet-app
flet-app
├── README.md
├── pyproject.toml
├── src
│   └── flet_app
│       ├── __init__.py
│       ├── assets
│       │   └── icon.png
│       └── main.py
├── storage
│   ├── data
│   └── temp
└── tests
    ├── __init__.py
    └── test_main.py

The tests folder would also be a great reminder, that tests for flet are already on the roadmap, see https://flet.dev/roadmap/#testing ;-)

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