Replace is_IntegerModRing by isinstance with new class sage.rings.abc.IntegerModRing

[mkoeppe]

(partially cherry-picked from #32432)

Part of Meta-ticket #32414

Depends on #32593

CC: @tscrim @fchapoton

Component: refactoring

Author: Matthias Koeppe

Branch/Commit: 907b57c

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/32606

[mkoeppe]

Branch: u/mkoeppe/replace_is_integermodring_by_isinstance_with_new_class_sage_rings_abc_integermodring

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

335cd3e

Replace all uses of is_IntegerModRing by isinstance(..., sage.rings.abc.IntegerModRing)

[sagetrac-git]

Commit: 335cd3e

[mkoeppe]

Description changed:

--- 
+++ 
@@ -1 +1,4 @@
+(partially cherry-picked from #32432)
 
+Part of Meta-ticket #32414
+

[mkoeppe]

Author: Matthias Koeppe

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

f596395

sage.rings.finite_rings.integer_mod_ring: Fixup

[sagetrac-git]

Changed commit from 335cd3e to f596395

[mkoeppe]

comment:7

Should the is_... function be deprecated?

[tscrim]

comment:8

I think we can just remove it altogether. It has been semi-officially deprecated and is only used internally (well, supposed to be). Perhaps better practice is to formally deprecate it though. So +1 to at least a deprecation.

[sagetrac-git]

Changed commit from f596395 to af06e5b

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

af06e5b

is_IntegerModRing: Deprecate

[tscrim]

comment:10

One more is_* function down. Thank you.

[tscrim]

Reviewer: Travis Scrimshaw