Add `WeightNorm` reparametrization #3604

Job	Run time
Documentation	9m 39s
Julia 1.10 - ubuntu-latest - x64	19m 21s
Julia 1 - ubuntu-latest - x64	28m 11s
Julia nightly - ubuntu-latest - x64	5m 47s
Julia 1 - windows-latest - x64	31m 37s
Julia 1 - macOS-latest - aarch64	18m 21s
	1h 52m 56s

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