Add in-place FedAvg #5842

Job	Run time
Build, test and upload wheel	1m 15s
Strategy / FedMedian	1m 5s
Framework / bare	1m 34s
Strategy / FedTrimmedAvg	1m 7s
Framework / bare-https	1m 16s
Strategy / QFedAvg	1m 16s
Framework / jax	2m 10s
Strategy / FaultTolerantFedAvg	1m 8s
Framework / pytorch	2m 49s
Strategy / FedAvgM	1m 8s
Framework / tensorflow	3m 11s
Strategy / FedAdam	1m 11s
Framework / tabnet	2m 33s
Strategy / FedAdagrad	1m 7s
Framework / opacus	2m 37s
Strategy / FedYogi	1m 5s
Framework / pytorch-lightning	2m 35s
Framework / mxnet	1m 44s
Framework / scikit-learn	2m 15s
Framework / fastai	4m 8s
Framework / pandas	1m 36s
	38m 50s

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