Add platform-specific dependencies to pyproject.toml

[FeodorFitsner]

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Describe the requested feature

A common for all platforms dependencies can be defined in pyproject.toml as:

[project]
dependencies = [
  "plyer==2.1.0"
]

or for Poetry configs:

[tool.poetry.dependencies]
plyer = "2.1.0"

The should be an ability to configure dependencies for each of the supported platforms: ios, android, windows, macos, linux and web, for example:

[tool.flet.ios]
dependencies = [
  "pyobjus"
]

[tool.flet.android]
dependencies = [
  "pyjnius"
]

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