fix: missing typings for CharsetToEncoding constants

Author: wellwelwel

typings/mysql/lib/constants/CharsetToEncoding.d.ts

@@ -0,0 +1,8 @@
+/**
+ * Constant `CharsetToEncoding`.
+ *
+ * Please note that `CharsetToEncoding` can only be accessed from the `mysql` object and not imported directly.
+ */
+declare const CharsetToEncoding: string[];
+
+export { CharsetToEncoding };

typings/mysql/lib/constants/index.d.ts

@@ -1,4 +1,5 @@
 import { Types } from './Types.js';
 import { Charsets } from './Charsets.js';
+import { CharsetToEncoding } from './CharsetToEncoding.js';
 
-export { Types, Charsets };
+export { Types, Charsets, CharsetToEncoding };