[react-native-loading-spinner-overlay] Add react-native-loading-spinner-overlay typings (#23829)

* Add react-native-loading-spinner-overlay typings

* Match `react` typescript version

types/react-native-loading-spinner-overlay/index.d.ts

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+// Type definitions for react-native-loading-spinner-overlay 0.5
+// Project: https://github.com/joinspontaneous/react-native-loading-spinner-overlay
+// Definitions by: fhelwanger <https://github.com/fhelwanger>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+import * as React from "react";
+import * as ReactNative from "react-native";
+
+export interface SpinnerProps {
+    cancelable?: boolean;
+    color?: string;
+    animation?: "none" | "slide" | "fade";
+    overlayColor?: string;
+    size?: "normal" | "small" | "large";
+    textContent?: string;
+    textStyle?: ReactNative.StyleProp<ReactNative.TextStyle>;
+    visible?: boolean;
+}
+
+export default class Spinner extends React.Component<SpinnerProps> {}

types/react-native-loading-spinner-overlay/react-native-loading-spinner-overlay-tests.tsx

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+import * as React from "react";
+import Spinner from "react-native-loading-spinner-overlay";
+
+() => {
+    <Spinner />;
+};
+
+() => {
+    <Spinner
+        cancelable={false}
+        color="red"
+        animation="slide"
+        overlayColor="black"
+        size="small"
+        textContent="text"
+        textStyle={{ fontSize: 14 }}
+        visible={true}
+    />;
+};

types/react-native-loading-spinner-overlay/tsconfig.json

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

types/react-native-loading-spinner-overlay/tslint.json

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