Layer 179, Poll entities, search_chats, edit_cached_media

Updated API schema to layer 179.

• Added :meth:`~pyrogram.Client.search_chats` method.
• Added :meth:`~pyrogram.Client.edit_cached_media` method.
• Added poll question and options entity support in :meth:`~pyrogram.Client.send_poll`.
• Added new functions from upstream.

• Fixed unused bugs in get_reply_message_parameters.
• Fixed forward filters bug.