Add request_poll support to KeyboardButton

[store-x]

Summary

This PR adds support for the request_poll parameter in the KeyboardButton class. This allows bots to create buttons that can prompt users to send polls directly from the chat.

Details

• Added request_poll parameter to KeyboardButton.
• Supports KeyboardButtonPollType for specifying poll types (regular or quiz).
• Matches the Telegram Bot API feature for poll requests.
• Enables private chat poll creation popup via buttons, which was previously unsupported in PyroFork.

Example

from pyrogram.types import KeyboardButton, KeyboardButtonPollType

button = KeyboardButton(
    text="Create Poll",
    request_poll=KeyboardButtonPollType(is_quiz=True)
)

[store-x]

@Mayuri-Chan ?