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StringLiteral

Summary: Following diff D45381213 disconnects `ConfiguredAttr` and `CoercedAttr` to avoid copy-paste extract code. This diff extracts `StringLiteral` which encapsulates string literal behavior.

Reviewed By: bobyangyf

Differential Revision: D45373416

fbshipit-source-id: 07e3fe38e843d3e159630a47c6b161de043fab5e