Integrate QEDevents.jl

[szabo137]

The subpackage QEDevents.jl needs to be integrated into QED.jl. This includes the following tasks

• make the top-level namespace of QEDevents.jl available in QED.jl
• add docs of QEDevents.jl as a page to the docs of QED.jl
• add integration tests from QEDevents.jl into the test suite of QED.jl
• pin the version of QEDevents.jl used in the current version of QED.jl

Requirements

The following items are required for QEDevents.jl to be integrated into QED.jl:

• implement necessary functions and data types to convert the differential cross-section of a given scattering process into a probability distribution
• implement sampler, pdf, and rand functions for the probability distributions to follow the random number interface of Julia
• unit tests to check the exposed functions for correctness (this will be called by QED.jl test suite)
• integration tests for any dependency within QED.jl (this will be called by QED.jl test suite)

The docs of QEDevents.jl should at least contain

• a landing page in the QEDevents.jl docs describing the purpose of the package
• API reference for all exposed functions and data types, as well as the respective page in the docs of QEDevents.jl
• a quickstart section showing the main functionality