feat: adding bot whitelist command to monitor 'enabled' channels

[0xDracula]

Adds a system to prevent unauthorized bots from joining channels where the bot is enabled (I made this PR due to what happened yesterday Slack Thread)

Commands

• /bot-whitelist status - View current settings for the channel.
• /bot-whitelist enable - Start protection (Firehose will join automatically).
• /bot-whitelist disable - Stop protection.
• /bot-whitelist add @bot - Add a bot to the "safe list".
• /bot-whitelist remove @bot - Remove from safe list (kicks them immediately if
  active).

What it does (in case it's enabled):

• Kicks any bots that joins the channel and not in the whitelist
• Removing a bot from whitelist triggers an immediate kick from the channel
• FIrehose itself is exempt from all this rules

[0xDracula]

What the last commit does?

• deletes top-level messages in enabled channels where the bot isn't whitelisted
• logs internally with a link to the marketplace to disable the bot

tested:

• sent a message to the channel while bot is whitelisted, and protection enabled -> worked (nothing happened)

• sent a message to a channel while the bot isn't whitelisted, and protection enabled -> bot kicked from channel, message deleted, logged internally

Bot Protection: Deleted top-level message from unauthorized bot Polls for Slack in #dev.
Original Message: https://hackclub.slack.com/archives/.....
Manage this bot: https://hackclub.slack.com/marketplace/<bot_id>