Feature Request: allow customized error handling

[Abdelgha-4]

The actual exception handing has two limitation:

• The actual exception object is inaccessible
• The current handle_exceptions decorators does not allow for custom error handling strategy

Ideally SolanaExceptionBase should store the inner exception object if the user code needs to handle it in a specific way, (examples: change the proxy on proxy errors, retry on connection errors, wait on rate limits etc...)

Also since the handle_exceptions decorators catch all occurring exceptions it'd be nice if you could specify the error handling logic there, it'd provide a centralized place for shared exception handling logic across all the methods.

Thank you

[michaelhly]

Happy to accept a PR