feat(RingTheory): support of quotient module

[erdOne]

---

[github-actions]

PR summary e7c3bc9644

Import changes exceeding 2%

%	File
+15.03%	Mathlib.RingTheory.Support

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.RingTheory.Support	1131	1301	+170 (+15.03%)
Mathlib.Algebra.Module.LocalizedModule.Submodule	991	1008	+17 (+1.72%)

Import changes for all files

Files	Import difference
Mathlib.Algebra.Module.LocalizedModule.Submodule	17
Mathlib.AlgebraicGeometry.PrimeSpectrum.Module	140
Mathlib.RingTheory.Support	170

---

Declarations diff

+ Module.support_quotient
+ localized₀_smul

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).

[erdOne]

I personally think the increase in import is fine as this is a leaf file, but if reviewers think otherwise I'm happy to split it.