Fix two memory leaks

[alexk111]

1st leak comes from Debug module, when debug instances are created within a function. For more info: debug-js/debug#678

2nd leak is caused by createClientRequestOverrideClass, when handleRequest is called multiple times (check screenshot below). It inherits ClientRequestOverride from a previous ClientRequestOverride instance:

• http.ClientRequest = ClientRequestOverride
  https://github.com/mswjs/node-request-interceptor/blob/728822439966cd06e67948e3bea370377d098177/src/interceptors/ClientRequest/index.ts#L33-L41
• next calls wrap ClientRequestOverride which wraps ClientRequestOverride which wraps ClientRequestOverride etc.
  https://github.com/mswjs/node-request-interceptor/blob/728822439966cd06e67948e3bea370377d098177/src/interceptors/ClientRequest/ClientRequestOverride.ts#L332

Maybe I'm missing something and you intentionally inherited it from http.ClientRequest instead of originalClientRequest?

[shanecurran]

Good catch 👍

[kettanaito]

This is a great improvement! Thank you, @alexk111, for investigating this and shipping a fix. You're awesome!