Make ChainRulesCore, ChangesOfVariables, and InverseFunctions weak dependencies #62
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By doing so, on Julia >= 1.9 support for these packages will be loaded only when the packages are loaded by the user (or some other package). Some more info about weak dependencies: https://pkgdocs.julialang.org/dev/creating-packages/#Conditional-loading-of-code-in-packages-(Extensions)
The PR is based on JuliaMath/SpecialFunctions.jl#421 and JuliaStats/StatsFuns.jl#153.