[stdlib] Character.unicodeScalars #9675
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Explanation: Adds a read-only
unicodeScalarsview toCharacterper SE-0178Scope: source-compatible Standard Library Extension
Radar: rdar://32249747 Add a read-only unicodeScalars view to Character per SE-0178
Risk: Very low; it's purely additive.
Testing: Passed full validation on master and here on the 4.0 branch