feat(Algebra/Category/ModuleCat): pullback of presheaves of modules

[joelriou]

In this PR, we construct the pullback functor for presheaves of modules.

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• [x] depends on: #18159
• [ ] depends on: #18160
• [x] depends on: #17388
• [x] depends on: #17389
• [x] depends on: #16755

[github-actions[bot]]

PR summary 776efee3a1

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference
Mathlib.Algebra.Category.ModuleCat.Presheaf.Pullback (new file)	1255

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Declarations diff

+ PullbackObjIsDefined + hasLimitsOfSize + instance : (pushforward.{u} φ).IsRightAdjoint + pullback + pullbackObjIsDefined_eq_top + pullbackObjIsDefined_free_yoneda + pullbackPushforwardAdjunction + pushforwardCompCoyonedaFreeYonedaCorepresentableBy

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.

---

Increase in tech debt: (relative, absolute) = (3.00, 0.00)

Current number	Change	Type
1419	3	erw

Current commit 776efee3a1 Reference commit 85ca5b28ae

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).

[mathlib4-dependent-issues-bot]

This PR/issue depends on:

• ~~leanprover-community/mathlib4#18159~~
• ~~leanprover-community/mathlib4#18160~~
• ~~leanprover-community/mathlib4#17388~~
• ~~leanprover-community/mathlib4#17389~~
• ~~leanprover-community/mathlib4#16755~~ By Dependent Issues (🤖). Happy coding!

[chrisflav]

Thanks!

maintainer merge

[github-actions[bot]]

🚀 Pull request has been placed on the maintainer queue by chrisflav.

[riccardobrasca]

This seems to have been forgotten. LTGM. Delegating just in case there is a reason has not been merged.

bors d+

[mathlib-bors[bot]]

:v: joelriou can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[joelriou]

Thanks!

bors merge

[mathlib-bors[bot]]

Pull request successfully merged into master.

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