Add a take method to Collections, Iterators, Arrays

With regards to a thread in the groovy user list here:

A take( n ) method would be a really useful addition to the Groovy codebase

It is assumed it will work similar to other languages, in that:

def a = [ 1, 2, 3 ]

assert a.take( 0 ) == []
assert a.take( 1 ) == [ 1 ]
assert a.take( 4 ) == [ 1, 2, 3 ]

The method should work for Collection, String, Map and lazily for Iterator, Reader and InputStream

relates to

GROOVY-5414 Groovy could benefit from DGM takeWhile and dropWhile methods

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