feat: revive legacy cogs

[WieeRd]

Revise, rewrite and bring back the outdated cogs at cogs/legacy/.

Remember, DO NOT try to refactor and add features at the same time.

I've been through this before, and it exponentially inflated the ETA of refactoring.
Just focus on bringing back the features as-is, as fast as possible.

Tier 1

Trivial yet major features that need to be brought back ASAP.
Should be fixed by adjusting discord.py breaking changes.

• Clock
• Tools
• Pranks
• Info
• Game
• Misc

Tier 2

This will take a non-trivial amount of efforts to implement.
Integration with DB and external APIs such as google TTS must be re-implemented.

• Bamboo
• Voice
• Owner

Tier 3

Legacy^2. Has been already outdated before the bot got abandoned.
No plan to bring them back now.

• Babel
• RTFM
• Mention
• April Fools