feat: simp local confluence testing

[kim-em]

This PR adds @nomeata's simp local confluence testing tool in Lean.Simplc, sets up exceptions in Lean.Simplc.Exception to run this on the core Lean library, and runs the confluence testing tool in CI. The README contains instructions for running this is in downstream repositories.

[tobiasgrosser]

This is exciting. Thank you @kim-em and @nomeata for this useful tool. I am happy to help further polishing the BitVec library with respect to confluence.

[leanprover-community-bot]

Mathlib CI status (docs):

• ✅ Mathlib branch lean-pr-testing-5717 has successfully built against this PR. (2024-10-15 09:49:23) View Log
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 5c70e5d8459ae445c237d85893e2e7280e226533 --onto 38c39482f40536b864a9b43c718e10e8413b26e5. (2024-10-31 01:51:30)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 465ed8af46e6a4491f9c81dd6d77ae37da11fd68 --onto 0fcee100e7ea382069854d91e854265c56b54428. (2024-11-01 02:39:53)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 1659f3bfe26545f77fe4ea84f61ce5e441dea87d --onto 0de925eafcfcff0f2c86e036f91bb451136b04c4. (2024-11-04 00:05:03)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase a4d521cf96d4994640c42d96b693c2d789016f5f --onto c779f3a039963fd38b03a78f635f0a7c36f24f42. (2024-11-05 02:45:38)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 8e2f92607fd20fc12b492504c4034e007ca3d927 --onto c779f3a039963fd38b03a78f635f0a7c36f24f42. (2024-11-05 10:52:35)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 4df71ed24f4be25ba0045b4963a03087d2302fa9 --onto c779f3a039963fd38b03a78f635f0a7c36f24f42. (2024-11-06 05:30:48)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 14c3d4b1a6cd6b9a755c952a2fa8f4c205c4b3e4 --onto c779f3a039963fd38b03a78f635f0a7c36f24f42. (2024-11-06 10:13:13)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 48e3d7617386ea44c92999afc2b555f3e6cb6ecd --onto 811d8fb3c01cf5724ba4daf733898793cca24bdd. (2024-11-11 03:48:06)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase f6e88e5a0525b744c5df018dd96d2f0cbca29435 --onto c5181569f959e4a0d9586954212125adcb6e44d0. (2024-12-05 06:00:28)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 00c7b85261d4b4bfb3659361edbf5005460e7c60 --onto c5181569f959e4a0d9586954212125adcb6e44d0. (2024-12-05 06:27:33)
• ❗ Mathlib CI can not be attempted yet, as the nightly-testing-2024-12-05 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-mathlib, Mathlib CI should run now. (2024-12-05 10:01:27)