Clean up some of the extensions (#8267)

* 💄

* prune unused code

* more cleanup

* remove abunch of used code

extensions/mssql/src/typings/bufferStreamReader.d.ts

@@ -0,0 +1,19 @@
+declare module 'buffer-stream-reader' {
+	import * as fs from 'fs';
+
+	class BufferStreamReader {
+		constructor(stream: string | Buffer);
+		pipe(pipe: fs.WriteStream): void
+	}
+
+	namespace BufferStreamReader {
+		interface FindRemoveOptions {
+			age?: {
+				seconds?: number;
+			};
+			limit?: number;
+		}
+	}
+
+	export = BufferStreamReader;
+}