Add typings for react-native-shared-group-preferences (#45423)

Co-authored-by: Anthony Campbell <acampbell2@officeworks.com.au>

types/react-native-shared-group-preferences/index.d.ts

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+// Type definitions for react-native-shared-group-preferences 1.1
+// Project: https://github.com/KjellConnelly/react-native-shared-group-preferences#readme
+// Definitions by: Cambo <https://github.com/indentedspace>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export interface SharedGroupPreferenceOptions {
+    useAndroidSharedPreferences?: boolean;
+}
+
+export namespace SharedGroupPreferences {
+    function isAppInstalledAndroid(packageName: string): Promise<void>;
+    function getItem(key: string, appGroup: string, options?: SharedGroupPreferenceOptions): Promise<any>;
+    function setItem(key: string, value: any, appGroup: string, options?: SharedGroupPreferenceOptions): Promise<void>;
+}
+
+export default SharedGroupPreferences;

types/react-native-shared-group-preferences/react-native-shared-group-preferences-tests.ts

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+import SharedGroupPreferences, { SharedGroupPreferenceOptions } from 'react-native-shared-group-preferences';
+
+const isAppInstalledAndroid = async (packageName: string) => {
+    let appIsInstalled;
+    try {
+        await SharedGroupPreferences.isAppInstalledAndroid(packageName);
+        appIsInstalled = true;
+    } catch (e) {
+        appIsInstalled = false;
+    }
+
+    return appIsInstalled;
+};
+
+const getItem = async (key: string, appGroup: string, options: SharedGroupPreferenceOptions) => {
+    const result = await SharedGroupPreferences.getItem(key, appGroup);
+    return result;
+};
+
+const setItem = async (key: string, data: any, appGroup: string, options: SharedGroupPreferenceOptions) => {
+    await SharedGroupPreferences.setItem(key, data, appGroup);
+};
+
+export default { isAppInstalledAndroid, getItem, setItem };

types/react-native-shared-group-preferences/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-native-shared-group-preferences-tests.ts"
+    ]
+}

types/react-native-shared-group-preferences/tslint.json

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+{ "extends": "dtslint/dt.json" }