added types for chai-snapshot-matcher (#48130)

* added types for chai-snapshot-matcher

* added missing overload and optional params

types/chai-snapshot-matcher/chai-snapshot-matcher-tests.ts

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+import chai = require('chai');
+
+const { expect } = chai;
+const context: Mocha.Context = <any> {};
+
+expect('foo').to.matchSnapshot(context);
+expect('foo').to.matchSnapshot(context, 'hint');
+
+expect('foo').to.matchSpecificSnapshot(context);
+expect('foo').to.matchSpecificSnapshot(context, { hint: "(hint)" });
+expect('foo').to.matchSpecificSnapshot(context, { name: "snapshot with a specific name" });
+expect('foo').to.matchSpecificSnapshot(context, { folder: "Examples" });
+expect('foo').to.matchSpecificSnapshot(context, { snapshotPath: "/Users/my.user/Downloads/MySnapshots/" });
+expect('foo').to.matchSpecificSnapshot(context, {
+    hint: "(hint)",
+    name: "snapshot with a specific name",
+    folder: "Examples",
+    snapshotPath: "/Users/my.user/Downloads/MySnapshots/"
+});

types/chai-snapshot-matcher/index.d.ts

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+// Type definitions for chai-snapshot-matcher 1.0
+// Project: https://github.com/tlameiras/chai-snapshot#readme
+// Definitions by: tpluscode <https://github.com/tpluscode>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+/// <reference types="chai" />
+
+import { Context } from 'mocha';
+
+declare global {
+  namespace Chai {
+    interface Assertion {
+      matchSnapshot(that: Context, hint?: string): void;
+      matchSpecificSnapshot(that: Context, options?: {
+          hint?: string;
+          name?: string;
+          folder?: string;
+          snapshotPath?: string;
+      }): void;
+    }
+  }
+}
+
+export {};

types/chai-snapshot-matcher/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",
+        "chai-snapshot-matcher-tests.ts"
+    ]
+}

types/chai-snapshot-matcher/tslint.json

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