[swift-evolution] [Draft] Apply -ed/-ing rule to core functional methods (e.g. filter => filtered)

[Brent Royal-Gordon]

> FWIW  `Where` is used as method also in c#
> 
> Example:
> IEnumerable<int> numQuery2 = numbers.Where(num => num % 2 == 0).OrderBy(n => n);

C# Where is part of LINQ; even when called as a method instead of as special syntax, it still has lazy, declarative behavior.

-- 
Brent Royal-Gordon
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