Add structured message for user input

[davorrunje]

Add new messages for inputs and use them in IOStream classes. E.g.

class InputMessageRequest(BaseMessage):
    pass

class InputMessageTextRequest(InputMessageRequest):
    prompt: str = ""

class InputMessagePasswordRequest(InputMessageRequest):
    prompt: str = ""

class InputMessageSingleChoiceRequest(InputMessageRequest):
    prompt: str = ""
    choices: list[str]

class InputMessageMultipleChoiceResponse(InputMessageResponse):
    prompt: str = ""
    choices: list[str]

class InputMessageResponse(BaseMessage):
    request: InputMessageRequest

class InputMessageTextResponse(InputMessageResponse):
    text: str

class InputMessagePasswordResponse(InputMessageResponse):
    password: str

class InputMessageSingleChoiceResponse(InputMessageResponse):
    choice: str

class InputMessageMultipleChoiceResponse(InputMessageResponse):
    choice: str


class InputStream(Protocol):
    def request_input(self, InputMessageRequest) -> InputMessageResponse:
        ...  # pragma: no cover