Add trait defining kotlin-like scope functions.
Currently provided functions are:
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transform()
: transform value to another.let v = gen_rand(0, 10).transform(|v| 'x'.repeat(v)); // => `v` is random length of "xx...".
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modify()
: modify the value and return.let v = vec![1, 2, 3].modify(|v| v.push(4)); // => `v` is [1, 2, 3, 4].