Allow to clear/disconnect the provider - specifically websocket provider

[liron-navon]

Describe the Feature

I didn't find a way in the documentation of how to clear a document, I found the ".removeAllListeners()" but is that enough? what about a WebSocket provider? can I close its connection somehow?
Can we add a function to clear provider resources like:

Code Example

provider.clear();
provider.disconnect();

[ricmoo]

I likely won't be making any new changes to the API for v5, but this features is available with the provider.destroy() method.