feat: Load from .SRCINFO

This adds a function to load package info from a .SRCINFO file using python-srcinfo.

The first unit test is rather ugly, because it needs normalization on the object created by load_from_pkgbuild before comparing the result of the new function. But it shows some potential issues that will need to be solved when migrating to .SRCINFO in the whole codebase.

Related to #91

added 1 commit

• 360d9524 - chore: install python-srcinfo in CI

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changed title from Load from .SRCINFO to feat: Load from .SRCINFO