Allow string transform style in TypeScript (#37569)

Summary:
Pull Request resolved: #37569

Fixes #37543

Missed as part of D39423409 (or maybe we didn't have TS types inline yet?)

Changelog:
[General][Fixed] - Allow string `transform` style in TypeScript

Reviewed By: cortinico

Differential Revision: D46161450

fbshipit-source-id: 24ee9e19365b7209ec0a2c8fb5a5d7ac78203f4d

Author: NickGerleman

Libraries/StyleSheet/StyleSheetTypes.d.ts

@@ -180,6 +180,7 @@ export interface TransformsStyle {
         | SkewYTransform
         | MatrixTransform
       )[]
+    | string
     | undefined;
   /**
    * @deprecated Use matrix in transform prop instead.