feat: update ConvMixer to support reactant #3654

Job	Run time
test (1.10, ubuntu-latest, core_layers)	3m 26s
downgrade	8m 28s
test (1.10, ubuntu-latest, normalize_layers)	1s
test (1.10, ubuntu-latest, recurrent_layers)	1s
test (1.10, ubuntu-latest, autodiff)	5m 20s
test (1.10, ubuntu-latest, misc)	5m 16s
test (1.10, ubuntu-latest, reactant)	1s
test (1, ubuntu-latest, core_layers)	1s
test (1, ubuntu-latest, normalize_layers)	1s
test (1, ubuntu-latest, recurrent_layers)	1s
test (1, ubuntu-latest, autodiff)	1s
test (1, ubuntu-latest, misc)	1s
test (1, ubuntu-latest, reactant)	1s
test (1.10, macos-latest, all)	1s
test (1.10, windows-latest, all)	10m 43s
	33m 23s

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