Add definitions for 'fold-to-ascii' (#47612)

Co-authored-by: Morgan Zolob <morgan.zolob@ingrooves.com>

types/fold-to-ascii/fold-to-ascii-tests.ts

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+import * as ASCIIFolder from 'fold-to-ascii';
+
+ASCIIFolder.foldReplacing('Lörem 🤧 ëripuît'); // $ExpectType string
+ASCIIFolder.foldReplacing('Lörem 🤧 ëripuît', 'X'); // $ExpectType string
+ASCIIFolder.foldMaintaining('Lörem 🤧 ëripuît'); // $ExpectType string

types/fold-to-ascii/index.d.ts

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+// Type definitions for fold-to-ascii 5.0
+// Project: https://github.com/mplatt/fold-to-ascii
+// Definitions by: Morgan Zolob <https://github.com/mogzol>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Replace all known non-ASCII characters with appropriate replacements,
+ * replace the unknown ones with a fallback
+ *
+ * @param str Input string containing ASCII and/or non-ASCII characters
+ * @param replacement Fallback for unknown characters in the input string
+ *                    (defaults to empty string)
+ */
+export function foldReplacing(str?: string, replacement?: string): string;
+
+/**
+ * Replace all known non-ASCII characters with appropriate replacements,
+ * maintain the unknown ones
+ *
+ * @param str Input string containing ASCII and/or non-ASCII characters
+ */
+export function foldMaintaining(str?: string): string;

types/fold-to-ascii/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",
+        "fold-to-ascii-tests.ts"
+    ]
+}

types/fold-to-ascii/tslint.json

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+{
+    "extends": "dtslint/dt.json",
+    "rules": { "npm-naming": [true, { "mode": "code", "errors": [["NeedsExportEquals", false]] }] }
+}