Add accessibilityLanguage type (facebook#35882)

Summary:
`accessibilityLanguage` is missing from `AccessibilityPropsIOS` TypeScript interface

## Changelog

[GENERAL] [FIXED] - Added missing `accessibilityLanguage` TypeScript type

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Pull Request resolved: facebook#35882

Test Plan: Ran `yarn test-typescript` and `yarn test-typescript-offline` and there were no errors.

Reviewed By: christophpurrer

Differential Revision: D42604363

Pulled By: NickGerleman

fbshipit-source-id: fb8dd4b5bba78a080473a9dc7b49a07587530229

Libraries/Components/View/ViewAccessibility.d.ts

@@ -290,6 +290,13 @@ export interface AccessibilityPropsIOS {
    * @platform ios
    */
   accessibilityIgnoresInvertColors?: boolean | undefined;
+
+  /**
+   * By using the accessibilityLanguage property, the screen reader will understand which language to use while reading the element's label, value and hint. The provided string value must follow the BCP 47 specification (https://www.rfc-editor.org/info/bcp47).
+   * https://reactnative.dev/docs/accessibility#accessibilitylanguage-ios
+   * @platform ios
+   */
+  accessibilityLanguage?: string | undefined;
 }
 
 export type Role =