Conditional dependencies marked as missing

[fpgmaas]

Describe the bug

If a conditional dependency like importlib-metadata = { version = "*", python = "<=3.7" } is not installed, it will be marked as missing:

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There are dependencies missing from pyproject.toml:

        importlib_metadata

Consider adding them to your project's dependencies. 

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This is because there is no way for deptry to link the module to the dependency if it is not installed.

There is a potential solution that should work in 95% of the cases; If a missing module is found AND there are conditional dependencies, do a similarity match between the dependency name and the module name. e.g. we could replace _ with - and check for equality, or use e.g. the Lehvenstein distance.