Tail expectation formula for L1 random variable #1553

Job	Run time
rocq-core	45s
coq	46s
mathcomp-analysis-single	19m 33s
mathcomp-classical	3m 13s
mathcomp-reals	2m 13s
mathcomp-experimental-reals	3m 21s
mathcomp-analysis	18m 44s
mathcomp-reals-stdlib	2m 56s
ssprove	2m 12s
mathcomp-analysis-stdlib	1m 52s
mathcomp-infotheo	9m 0s
	1h 4m 35s

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