Add new key called "message_type" for Message class

[Dexter2389]

From the message table, use the message_type to determine what kind of message was sent (just more metadata). Here is a reference key table for what each message_type mean:

• when 0 then 'text'
• when 1 then 'image'
• when 2 then 'video'
• when 3 then 'voice_message'
• when 4 then 'gif'
• when 5 then 'location'
• when 6 then 'group_event'
• when 7 then 'hyperlink'
• when 8 then 'document'
• when 14 then 'deleted_message'
• when 15 then 'sticker'
• when 16 then 'live_location'
• else 'unknown'