feat: update ConvMixer to support reactant (#1063) #3928

Job	Run time
test (1.10, ubuntu-latest, core_layers)	23m 30s
downgrade	0s
test (1.10, ubuntu-latest, normalize_layers)	24m 12s
test (1.10, ubuntu-latest, recurrent_layers)	32m 49s
test (1.10, ubuntu-latest, autodiff)	51m 5s
test (1.10, ubuntu-latest, misc)	32m 46s
test (1.10, ubuntu-latest, reactant)	13m 24s
test (1, ubuntu-latest, core_layers)	31m 37s
test (1, ubuntu-latest, normalize_layers)	32m 49s
test (1, ubuntu-latest, recurrent_layers)	43m 14s
test (1, ubuntu-latest, autodiff)	42m 14s
test (1, ubuntu-latest, misc)	40m 55s
test (1, ubuntu-latest, reactant)	17m 40s
test (1, macos-latest, all)	6h 0m 24s
test (1, windows-latest, all)	1h 41m 11s
	14h 7m 50s

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