🐛 send multiple messages if solution is too big

[twentylemon]

Summary

Fixes #959

Discord has a message size limit, which sometimes big solutions will run into. This chunks up the message into the biggest possible components that can fit into a single message, then send multiple messages.

Checklist

• [x] this is a source code change
  • [x] run format in the repository root
  • [x] run pytest in the repository root
  • [x] link to issue being fixed using a fixes keyword, if such an issue exists
  • [ ] update the wiki documentation if necessary
• [ ] or, this is not a source code change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.53%. Comparing base (ba5f2ea) to head (6b3ec39). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1006 +/- ## ========================================== + Coverage 96.51% 96.53% +0.02% ========================================== Files 95 95 Lines 2237 2251 +14 Branches 165 168 +3 ========================================== + Hits 2159 2173 +14 Misses 67 67 Partials 11 11 ```

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