Remove backwards compatibility package extension logic

[mtfishman]

Some weakdeps were listed as deps so that package extensions could be loaded in older Julia versions, which doesn't seem necessary now since LazyArrays.jl requires Julia 1.10. See also JuliaArrays/BlockArrays.jl#431.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.65%. Comparing base (eeea5ff) to head (58fedb5).
Report is 1 commits behind head on master.

Additional details and impacted files

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##           master     #347   +/-   ##
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  Coverage   95.65%   95.65%           
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  Files          17       17           
  Lines        3155     3155           
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  Hits         3018     3018           
  Misses        137      137           

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[dlfivefifty]

Thanks. Just curious is there any negative impact on including them as both dependencies and weak dependencies?

[mtfishman]

Thanks. Just curious is there any negative impact on including them as both dependencies and weak dependencies?

I think in principle it shouldn't, though my guess is that it will fix the test failure related to LazyArraysBlockArraysExt discussed in JuliaArrays/BlockArrays.jl#431. I think maybe for now it just confuses the package system about what dependencies are expected to be loaded, though that is probably a bug and the package system should be smart enough to deal with it. (Also, I like to look at the Project.toml of packages to see what kind of dependencies it has, so listing things as dependencies which are really just weak dependencies may confuse people.)

[mtfishman]

As a more obvious downside of listing them as both dependencies and weak dependencies, didn't that cause those packages (BandedMatrices, BlockArrays, BlockBandedMatrices, StaticArrays) to be downloaded and installed for every user, even if they didn't need them?