Rework `info` Slack command

[TimJentzsch]

The info Slack command is quite old and could use some improvements:

• Improve the message layout (the ASCII table is hard to read on mobile).
• Add number of recent transcriptions (e.g. last 2 weeks).
• Add time that they were last active.
• Add number of total checks and percentage of checked transcriptions.
• Add number and percentage of comments/warning checks.

It could look something like this:

---

Info about u/username:

General:

• Gamma: 23 Γ (7 Γ in last 2 weeks)
• Joined on: 2021-03-08 (1 year ago)
• Last active: 2022-04-01 (3 weeks ago)

Transcription Quality:

• Checks: 17 (73.9% of transcriptions)
• Comments: 4 (23.5% of checks)
• Warnings: 1 (5.9% of checks)
• Watch status: 80% (Automatic)

Debug Info:

• ID: 1234
• Blacklisted: No
• Is Bot: No
• Accepted CoC: Yes