8140283: add Stream::transform method to facilitate fluent chaining of other methods

[Mohamed Maaliki]

I’ve started working on the RFE mentioned in the title. At the moment 
I’ve implemented the method in |BaseStream| in order to cover every 
stream type: is that alright or should I restrict it to |Stream|? And if 
there’s anything else that I should know, then please let me know. Thanks.

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