Optional dependencies with fpm

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Regarding syntax for optional dependencies, poetry might be a good source of inspiration, especially the concept of (optional) groups.

Managing dependencies | Documentation | Poetry - Python dependency management and packaging made easy (python-poetry.org)

You end up with something like so:

...
[tool.poetry.dependencies]
python = ">=3.9,<4.0"
numpy = "^1.23.5"
...

[tool.poetry.group.docs]
optional = true
[tool.poetry.group.docs.dependencies]
mkdocs = "^1.4.2"
mkdocs-material = "^9.5.3"
...

[tool.poetry.group.dev]
optional = true
[tool.poetry.group.dev.dependencies]
pytest = "^8.1.1"
pytest-cov = "^5.0.0"
...

You activate optional groups with --with:

poetry install --with dev,docs
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