Add Cheer Alert module

[ALazyMeme]

Pull request checklist:

• CHANGELOG.md was updated, if applicable
• Documentation in docs/ or install-docs/ was updated, if applicable

Added a cheer alert module, the amounts are pre-defined to twitch's default bit amounts you can purchase. Everything above 1 bit I've left intentionally blank (I'm not creative enough to think up of several different messages, and if I'm inputting the same message everytime; then it's pointless).

[ALazyMeme]

This is mostly done, but I'm running into a fairly major issue. I don't believe the on_pubmsg has support for the tags argument? Maybe I'm wrong:

 [2021-02-06 14:27:23,945] [ERROR  ] Unhandled exception from <bound method CheerAlertModule.on_pubmsg of <pajbot.modules.chat_alerts.cheeralert.CheerAlertModule object at 0x7f80cc038760>> in on_pubmsg
 Traceback (most recent call last):
   File "/opt/pajbot/pajbot/managers/handler.py", line 116, in trigger
     res = handler(*args, **kwargs)
 TypeError: on_pubmsg() missing 1 required positional argument: 'tags'

[ALazyMeme]

Ok, I've fixed the tags issue, running into a new issue where points are not given and the bot does not announce the points

[ALazyMeme]

SO the issue was fixed by changing the key names not not start with a number

[ALazyMeme]

Will push a changelog commit once #1157 is merged