samples for Iterable feature extractors

[robstoll]

Platform (all, jvm, js): all Extension (none, kotlin 1.3): none

Code related feature

api-fluent api-fluent

• [ ] add a minFeature method in IterableFeatureExtractorSamples for expect(iterable).min()
• [ ] add a min method IterableFeatureExtractorSamples for expect(iterable).min { } (i.e. the overload with the assertionCreator-lambda)
• [ ] add a maxFeature method in IterableFeatureExtractorSamples for expect(iterable).max()
• [ ] add a max method IterableFeatureExtractorSamples for expect(iterable).max { } (i.e. the overload with the assertionCreator-lambda)
• [ ] link in the KDoc of the corresponding function in iterableLikeToContain...Creators.kt to the samples via @sample (see charSequenceToContainCreators.kt)

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