E2E

feat(datasets) Add tests for femnist dataset #12926

Job	Run time
Build, test and upload wheel	1m 18s
Framework / bare	3m 25s
Strategy / FedMedian	1m 14s
Framework / bare-https	1m 24s
Strategy / FedTrimmedAvg	1m 16s
Framework / bare-client-auth	1m 1s
Strategy / QFedAvg	1m 14s
Framework / framework-jax	1m 16s
Strategy / FaultTolerantFedAvg	2m 36s
Framework / framework-pytorch	1m 59s
Strategy / FedAvgM	1m 12s
Framework / framework-tensorflow	3m 12s
Strategy / FedAdam	1m 13s
Framework / framework-opacus	2m 9s
Strategy / FedAdagrad	1m 13s
Framework / framework-pytorch-lightning	1m 37s
Strategy / FedYogi	1m 9s
Framework / framework-scikit-learn	1m 39s
Framework / framework-fastai	2m 46s
Framework / framework-pandas	1m 8s
	34m 1s

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