Add type definition for domelementtype (#33854)

* Added new types for domelementtype

* Updating PULL_REQUEST_TEMPLATE.md

* Revert changes to .github/PULL_REQUEST_TEMPLATE.md

types/domelementtype/domelementtype-tests.ts

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+import { DomElementType } from "domelementtype";
+
+console.log(DomElementType.Text === 'text');
+console.log(DomElementType.Directive === 'directive');
+console.log(DomElementType.Comment === 'comment');
+console.log(DomElementType.Script === 'script');
+console.log(DomElementType.Style === 'style');
+console.log(DomElementType.Tag === 'tag');
+console.log(DomElementType.CDATA === 'cdata');
+console.log(DomElementType.Doctype === 'doctype');
+console.log(DomElementType.isTag({ type: DomElementType.Tag }));
+console.log(DomElementType.isTag({ type: DomElementType.Doctype }));

types/domelementtype/index.d.ts

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+// Type definitions for domelementtype 1.3
+// Project: https://github.com/fb55/domelementtype#readme
+// Definitions by: Johan Davidsson <https://github.com/johandavidson>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+export namespace DomElementType {
+    /***
+     * Text
+     */
+    const Text = "text";
+    /***
+     * <? ... ?>
+     */
+    const Directive = "directive";
+    /***
+     * <!-- ... -->
+     */
+    const Comment = "comment";
+    /***
+     * <script> tags
+     */
+    const Script = "script";
+    /***
+     * <style> tags
+     */
+    const Style = "style";
+    /***
+     * Any tag
+     */
+    const Tag = "tag";
+    /***
+     * <![CDATA[ ... ]]>
+     */
+    const CDATA = "cdata";
+    /***
+     * <!DOCTYPE ... >
+     */
+    const Doctype = "doctype";
+
+    /***
+     * Checks whether element object is a tag
+     */
+    function isTag(elem: { type: string}): boolean;
+}

types/domelementtype/tsconfig.json

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

types/domelementtype/tslint.json

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