feat(glur): type definitions for glur (#44410)

- definition files
- tests

https://www.npmjs.com/package/glur
https://github.com/nodeca/glur#api

Thanks!

types/glur/glur-tests.ts

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+import blurRGBA = require('glur');
+import blurRGBAMono = require('glur/mono16');
+
+const testRGBA = (src: Uint8Array) => {
+    blurRGBA(src, 100, 100, 50); // $ExpectType void
+};
+
+const testMono16 = (src: Uint16Array) => {
+    blurRGBAMono(src, 100, 100, 50); // $ExpectType void
+};

types/glur/index.d.ts

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+// Type definitions for glur 1.1
+// Project: https://github.com/andr83/glur/issues
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+/// <reference types="node" />
+
+/**
+ * Fast Gaussian Blur in pure JavaScript, via IIR filer.
+ * Speed does not depend on blur radius
+ * @param src - typed array with image RGBA data (will be updated with blurred image)
+ * @param width - image width
+ * @param height - image height
+ * @param radius - blur radius
+ */
+declare function blurRGBA(src: Uint8Array, width: number, height: number, radius: number): void;
+
+/**
+ * Fast gaussian blur in pure JavaScript via IIR filer
+ */
+export = blurRGBA;

types/glur/mono16.d.ts

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+/**
+ * Fast Gaussian Blur in pure JavaScript, via IIR filer.
+ * Speed does not depend on blur radius
+ * Can be useful to calculate unsharp mask via brightness/lightness channel
+ * @param src - typed array with image grayscale data (will be updated with blurred image)
+ * @param width - image width
+ * @param height - image height
+ * @param radius - blur radius
+ */
+declare function blurMono16(src: Uint16Array, width: number, height: number, radius: number): void;
+
+/**
+ * Fast gaussian blur in pure JavaScript via IIR filer.
+ * Input data is grayscale Uint16Array
+ */
+export = blurMono16;

types/glur/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",
+        "glur-tests.ts"
+    ]
+}

types/glur/tslint.json

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