feat: update ConvMixer to support reactant (#1063) #297

Job	Run time
downgrade	0s
test (1, ubuntu-latest, conv, default, true)	37m 43s
test (1, ubuntu-latest, dense, default, true)	26m 32s
test (1, ubuntu-latest, normalization, default, true)	1h 19m 0s
test (1, ubuntu-latest, misc, default, true)	45m 51s
test (1, ubuntu-latest, dense, default, false)	23m 19s
test (1, ubuntu-latest, misc, default, false)	37m 52s
test (1, macos-latest, all, default, true)	5h 9m 4s
test (1, windows-latest, all, default, true)	1h 54m 24s
	11h 13m 45s

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