chore(Tactic): move StacksAttribute to CrossRefAttribute (#39257)

This PR moves StacksAttribute.lean to CrossRefAttribute.lean
both in Mathlib/Tactic/ and in MathlibTest/.

In the future, we can refactor the file to abstract over the type of
cross-references. Currently, cross-reference attributes are implemented
for the Stacks Project and Kerodon.
A good candidate for a future PR is to add an attribute for Wikidata
identifiers.

Author: jcommelin

Mathlib.lean

@@ -7101,6 +7101,7 @@ public import Mathlib.Tactic.Contrapose
 public import Mathlib.Tactic.Conv
 public import Mathlib.Tactic.Convert
 public import Mathlib.Tactic.Core
+public import Mathlib.Tactic.CrossRefAttribute
 public import Mathlib.Tactic.DSimpPercent
 public import Mathlib.Tactic.DeclarationNames
 public import Mathlib.Tactic.DefEqAbuse
@@ -7317,7 +7318,6 @@ public import Mathlib.Tactic.Simps.Basic
 public import Mathlib.Tactic.Simps.NotationClass
 public import Mathlib.Tactic.SplitIfs
 public import Mathlib.Tactic.Spread
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Tactic.Subsingleton
 public import Mathlib.Tactic.Substs
 public import Mathlib.Tactic.SuccessIfFailWithMsg

Mathlib/Algebra/Ring/Defs.lean

@@ -7,8 +7,8 @@ module
 
 public import Mathlib.Algebra.GroupWithZero.Defs
 public import Mathlib.Data.Int.Cast.Defs
+public import Mathlib.Tactic.CrossRefAttribute
 public import Mathlib.Tactic.Spread
-public import Mathlib.Tactic.StacksAttribute
 
 /-!
 # Semirings and rings

Mathlib/CategoryTheory/Category/Basic.lean

@@ -8,8 +8,8 @@ module
 public import Mathlib.CategoryTheory.Category.Init
 public import Mathlib.Combinatorics.Quiver.Basic
 public import Mathlib.Tactic.PPWithUniv
+public import Mathlib.Tactic.CrossRefAttribute
 public import Mathlib.Tactic.Common
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Tactic.TryThis
 
 /-!

Mathlib/Tactic.lean

@@ -74,6 +74,7 @@ public import Mathlib.Tactic.Contrapose
 public import Mathlib.Tactic.Conv
 public import Mathlib.Tactic.Convert
 public import Mathlib.Tactic.Core
+public import Mathlib.Tactic.CrossRefAttribute
 public import Mathlib.Tactic.DSimpPercent
 public import Mathlib.Tactic.DeclarationNames
 public import Mathlib.Tactic.DefEqAbuse
@@ -290,7 +291,6 @@ public import Mathlib.Tactic.Simps.Basic
 public import Mathlib.Tactic.Simps.NotationClass
 public import Mathlib.Tactic.SplitIfs
 public import Mathlib.Tactic.Spread
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Tactic.Subsingleton
 public import Mathlib.Tactic.Substs
 public import Mathlib.Tactic.SuccessIfFailWithMsg

Mathlib/Tactic/StacksAttribute.lean Mathlib/Tactic/CrossRefAttribute.leanMathlib/Tactic/StacksAttribute.lean renamed to Mathlib/Tactic/CrossRefAttribute.lean

@@ -8,8 +8,8 @@ module
 public import Mathlib.Order.Minimal
 public import Mathlib.Order.Zorn
 public import Mathlib.Topology.ContinuousOn
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Topology.DiscreteSubset
+public import Mathlib.Tactic.CrossRefAttribute
 
 /-!
 # Irreducibility in topological spaces

Mathlib/Topology/Irreducible.lean

@@ -7,7 +7,7 @@ module
 
 public import Mathlib.Topology.LocalAtTarget
 public import Mathlib.Topology.Separation.Regular
-public import Mathlib.Tactic.StacksAttribute
+public import Mathlib.Tactic.CrossRefAttribute
 
 /-!
 

Mathlib/Topology/JacobsonSpace.lean

@@ -11,7 +11,7 @@ public import Mathlib.Topology.Piecewise
 public import Mathlib.Topology.Separation.SeparatedNhds
 public import Mathlib.Topology.Compactness.LocallyCompact
 public import Mathlib.Topology.Bases
-public import Mathlib.Tactic.StacksAttribute
+public import Mathlib.Tactic.CrossRefAttribute
 
 /-!
 # Separation properties of topological spaces

Mathlib/Topology/Separation/Basic.lean

@@ -5,10 +5,10 @@ Authors: Johannes Hölzl, Mario Carneiro
 -/
 module
 
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Topology.Compactness.Lindelof
 public import Mathlib.Topology.Separation.Hausdorff
 public import Mathlib.Topology.Connected.Clopen
+public import Mathlib.Tactic.CrossRefAttribute
 
 /-!
 # Regular, normal, T₃, T₄ and T₅ spaces

Mathlib/Topology/Separation/Regular.lean

@@ -5,9 +5,9 @@ Authors: Yaël Dillies
 -/
 module
 
-public import Mathlib.Tactic.StacksAttribute
 public import Mathlib.Topology.ContinuousMap.Basic
 public import Mathlib.Topology.Maps.Proper.Basic
+public import Mathlib.Tactic.CrossRefAttribute
 
 /-!
 # Spectral maps