E2E

feat(framework) Add `ClientAppIo` servicer #14312

Job	Run time
Build, test and upload wheel	1m 16s
Strategy / FedMedian	1m 14s
Template / numpy	1m 1s
Strategy / FedTrimmedAvg	1m 25s
Template / pytorch	2m 58s
Strategy / QFedAvg	1m 18s
Template / tensorflow	1m 55s
Strategy / FaultTolerantFedAvg	1m 18s
Template / jax	58s
Strategy / FedAvgM	1m 29s
Template / sklearn	1m 51s
Strategy / FedAdam	1m 18s
Framework / bare	4m 38s
Strategy / FedAdagrad	1m 20s
Framework / bare-https	1m 16s
Strategy / FedYogi	1m 31s
Framework / bare-client-auth	1m 38s
Framework / framework-jax	1m 35s
Framework / framework-pytorch	2m 3s
Framework / framework-tensorflow	3m 12s
Framework / framework-opacus	1m 59s
Framework / framework-pytorch-lightning	1m 39s
Framework / framework-scikit-learn	1m 58s
Framework / framework-fastai	3m 5s
Framework / framework-pandas	1m 10s
	45m 5s

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