[Merged by Bors] - feat: allow grind to unfold abs

[kim-em]

Following discussion on zulip#general > "Missing Tactics" list @ 💬.

[github-actions]

PR summary b3cf7a02d3

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[b-mehta]

!bench

[leanprover-radar]

Benchmark results for 4da9018 against b3cf7a0 are in! @b-mehta

[leanprover-bot]

Here are the benchmark results for commit 4da9018.
There were no significant changes against commit b3cf7a0.

[github-actions]

File	Instructions	%
build	+14.916⬝10⁹	(+0.00%)
Mathlib.Algebra.Module.Submodule.Equiv	+1.145⬝10⁹	(+4.67%)
CI run Lakeprof report

[j-loreaux]

I think we want this, but I'd like a second opinion.

maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by j-loreaux.

[jcommelin]

Thanks 🎉

bors merge

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

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