feat(get-image-colors): new definition (#47809)

- definition types
- tests

https://github.com/colorjs/get-image-colors

Thanks!

types/get-image-colors/get-image-colors-tests.ts

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+import path = require('path');
+import fs = require('fs');
+import getColors = require('get-image-colors');
+import { Options } from 'get-image-colors';
+
+const buffer = fs.readFileSync(path.join(__dirname, 'double-rainbow.gif'));
+const options: Options = {
+    count: 10,
+    type: 'image/png',
+};
+
+getColors('./path').then(colors => {
+    colors; // $ExpectType Color[]
+});
+getColors('./path', (err, colors) => {
+    if (err) throw err;
+    colors; // $ExpectType Color[]
+});
+
+getColors(buffer, 'image/gif').then(colors => {
+    colors; // $ExpectType Color[]
+    colors.map(color => color.hex());
+    colors[0].alpha(0.5).css();
+});
+
+getColors(path.join(__dirname, 'double-rainbow.png'), options).then(colors => {
+    colors; // $ExpectType Color[]
+});

types/get-image-colors/index.d.ts

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+// Type definitions for get-image-colors 2.0
+// Project: https://github.com/colorjs/get-image-colors#readme
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+/// <reference types="node" />
+import chroma = require('chroma-js');
+
+/**
+ * Extract colors from images. Supports GIF, JPG, PNG, and even SVG!
+ */
+declare function colorPalette(input: Buffer, options: colorPalette.Options, callback: chroma.Color[]): void;
+declare function colorPalette(input: Buffer, type: string, callback: colorPalette.Callback): void;
+declare function colorPalette(input: Buffer, type: string): Promise<chroma.Color[]>;
+declare function colorPalette(input: string, options?: colorPalette.Options): Promise<chroma.Color[]>;
+declare function colorPalette(input: string, callback: colorPalette.Callback): void;
+
+declare namespace colorPalette {
+    interface Options {
+        type?: string;
+        /**
+         * @default 5
+         */
+        count?: number;
+    }
+
+    /**
+     * If you don't like promises, you can use node-style callbacks too
+     */
+    type Callback = (error: Error | null, colors: chroma.Color[]) => void;
+}
+
+export = colorPalette;

types/get-image-colors/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",
+        "get-image-colors-tests.ts"
+    ]
+}

types/get-image-colors/tslint.json

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