Master PR for Bot API 9.0.
When ready,closes#4754 .

Checklist

• double checkhttps://t.me/bot_api_changes/239 for changes
• Added.. versionadded:: NEXT.VERSION,.. versionchanged:: NEXT.VERSION,.. deprecated:: NEXT.VERSION or.. versionremoved:: NEXT.VERSION to the docstrings for user facing changes (for methods/class descriptions, arguments and attributes)
• Created new or adapted existing unit tests
• Documented code changes according to theCSI standard
• Added myself alphabetically toAUTHORS.rst (optional)
• Added new classes & modules to the docs and all suitable__all__ s
• Checked theStability Policy in case of deprecations or changes to documented behavior

If the PR contains API changes (otherwise, you can ignore this passage)

• Checked the Bot API specific sections of theStability Policy

• Created a PR to remove functionality deprecated in the previous Bot API release (see here)

• New classes:

  • Addedself._id_attrs and corresponding documentation
  • __init__ acceptsapi_kwargs as kw-only

• Added new shortcuts:

  • Intelegram.Chat &telegram.User for all methods that acceptchat/user_id
  • Intelegram.Message for all methods that acceptchat_id andmessage_id
  • For newtelegram.Message shortcuts: Addedquote argument if methods acceptsreply_to_message_id
  • Intelegram.CallbackQuery for all methods that accept eitherchat_id andmessage_id orinline_message_id

• If relevant:

  • Added new constants attelegram.constants and shortcuts to them as class variables
  • Link new and existing constants in docstrings instead of hard-coded numbers and strings
  • Add new message types totelegram.Message.effective_attachment
  • Added new handlers for new update types
    • Add the handlers to the warning loop in thetelegram.ext.ConversationHandler
  • Added new filters for new message (sub)types
  • Added or updated documentation for the changed class(es) and/or method(s)
  • Added the new method(s) to_extbot.py
  • Added or updatedbot_methods.rst
  • Updated the Bot API version number in all places:README.rst (including the badge) andtelegram.constants.BOT_API_VERSION_INFO
  • Added logic for arbitrary callback data intelegram.ext.ExtBot for new methods that either accept areply_markup in some form or have a return type that is/containstelegram.Message