Add C++ workflow file #3916

Job	Run time
Build, test and upload wheel	1m 26s
Framework / bare	1m 47s
Strategy / FedMedian	1m 23s
Strategy / FedTrimmedAvg	1m 29s
Framework / jax	4m 4s
Strategy / QFedAvg	1m 22s
Framework / pytorch	3m 19s
Strategy / FaultTolerantFedAvg	1m 37s
Framework / tensorflow	3m 48s
Strategy / FedAvgM	1m 41s
Framework / tabnet	3m 5s
Strategy / FedAdam	1m 24s
Framework / opacus	4m 9s
Strategy / FedAdagrad	1m 22s
Framework / pytorch-lightning	3m 11s
Strategy / FedYogi	1m 36s
Framework / mxnet	1m 56s
Framework / scikit-learn	2m 38s
Framework / fastai	4m 46s
Framework / pandas	1m 46s
	47m 49s

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