Expose Exception Attributes on SolanaRpcException

[datasalaryman]

The current implementation of SolanaRpcException only takes in the Exception exc but does not expose it to the user. They cannot access its attributes and diagnose further when there are problems.

Sending this as a draft pull request until I figure out how this works properly.

class SolanaRpcException(SolanaExceptionBase):
    """Class for Solana-py RPC exceptions."""

    @staticmethod
    def _build_error_message(
        exc: Exception,
        func: Callable[[Any], Any],  # noqa: ARG004
        *args: Any,
        **kwargs: Any,  # noqa: ARG004
    ) -> str:
        rpc_method = args[1].__class__.__name__
        return f'{type(exc)} raised in "{rpc_method}" endpoint request'