Unimplemented actions should throw an error

[osis]

Describe the bug
Right now unimplemented action functionality utilizes console.warn. It would be better to explicitly warn users by throwing errors to make sure there they are aware that nothing is going to happen.

example...

export const deleteAccount = async (_i: number): Promise<void> => {
  throw NotImplementedError('deleteAccount not implemented - Coinbase does not support importing/removing additional private keys');
};