Make function record subinterpreter safe (#5771)

* Make function_record type subinterpreter safe

* Get rid of static state in implicit conversion

* style: pre-commit fixes

* Fix lambda

* Bump ABI because we added an internals member

* Set __module__ on the type instance to get rid of DepricationWarning

* Work around internal compiler error in CUDA by not using typedef

hopefully

* Make clang-tidy happy

* Use the same __module__ as pybind11_static_property

* style: pre-commit fixes

* Oops, find-replace error

* style: pre-commit fixes

* Move the once initialization to happen more behind the scenes

* Oops, need those casts...

* Undo implicit conversion change, will do a separate PR

* Use local_internals for function_record pointer to avoid ABI bump

* style: pre-commit fixes

* Get rid of this auto for readability

* Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-(

* Revert "Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-("

This reverts commit 9ccd6de9b7.

* Add Py_TPFLAGS_HEAPTYPE to be explicit (more readable).

* Remove obsolete PYBIND11_WARNING_DISABLE_...

* Make tp_plainname_impl, tp_qualname_impl more DRY

* Change PYBIND11_INTERNAL_MODULE_NAME → PYBIND11_DUMMY_MODULE_NAME

* Add a long comment to explain the tp_qualname_impl workaround.

* Rename local_internals::function_record → function_record_py_type

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgkio@gmail.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rgrossekunst@nvidia.com>

tests/test_callbacks.cpp

@@ -286,13 +286,7 @@ TEST_SUBMODULE(callbacks, m) {
         return &def;
     }();
 
-    // rec_capsule with name that has the same value (but not pointer) as our internal one
-    // This capsule should be detected by our code as foreign and not inspected as the pointers
-    // shouldn't match
-    constexpr const char *rec_capsule_name
-        = pybind11::detail::internals_function_record_capsule_name;
     py::capsule rec_capsule(std::malloc(1), [](void *data) { std::free(data); });
-    rec_capsule.set_name(rec_capsule_name);
     m.add_object("custom_function", PyCFunction_New(custom_def, rec_capsule.ptr()));
 
     // rec_capsule with nullptr name