conditional glow 3d w test and example

[rafaelorozco]

quick dimension fixes so that conditional glow works for 3d

[mloubout]

Can you add julia 1.8 to CI

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.39 :tada:

Comparison is base (1adcc49) 88.09% compared to head (0b5e476) 88.48%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #66 +/- ## ========================================== + Coverage 88.09% 88.48% +0.39% ========================================== Files 33 33 Lines 2545 2545 ========================================== + Hits 2242 2252 +10 + Misses 303 293 -10 ``` | [Impacted Files](https://codecov.io/gh/slimgroup/InvertibleNetworks.jl/pull/66?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slimgroup) | Coverage Δ | | |---|---|---| | [src/conditional\_layers/conditional\_layer\_glow.jl](https://codecov.io/gh/slimgroup/InvertibleNetworks.jl/pull/66?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slimgroup#diff-c3JjL2NvbmRpdGlvbmFsX2xheWVycy9jb25kaXRpb25hbF9sYXllcl9nbG93Lmps) | `97.72% <100.00%> (ø)` | | | [...rc/networks/invertible\_network\_conditional\_glow.jl](https://codecov.io/gh/slimgroup/InvertibleNetworks.jl/pull/66?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slimgroup#diff-c3JjL25ldHdvcmtzL2ludmVydGlibGVfbmV0d29ya19jb25kaXRpb25hbF9nbG93Lmps) | `96.05% <100.00%> (+13.15%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slimgroup). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slimgroup)

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