bpo-35081: Add Include/internal/pycore_object.h (GH-10640)

Move _PyObject_GC_TRACK() and _PyObject_GC_UNTRACK() from
Include/objimpl.h to Include/internal/pycore_object.h.
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index e1e45dc..6f855b9 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -9,6 +9,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_object.h"
 #include "pycore_pystate.h"
 #include "structmember.h"
 #include "pythread.h"
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index a50add2..8e54ec8 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_object.h"
 #include "structmember.h"       /* for offsetof() */
 #include "_iomodule.h"
 
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index ffcb730..c502c43 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -2,6 +2,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_object.h"
 #include "structmember.h"
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 5b71732..9b063cd 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -10,6 +10,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_object.h"
 #include "structmember.h"
 #include "_iomodule.h"
 
diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index 793fa1e..bb5c373 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -2,6 +2,7 @@
 #include "Python.h"
 #include "structmember.h"
 #include "pycore_accu.h"
+#include "pycore_object.h"
 #include "_iomodule.h"
 
 /* Implementation note: the buffer is always at least one character longer
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 8924834..645d712 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -8,6 +8,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_object.h"
 #include "structmember.h"
 #include "_iomodule.h"
 
diff --git a/Modules/_io/winconsoleio.c b/Modules/_io/winconsoleio.c
index 148255c..824690f 100644
--- a/Modules/_io/winconsoleio.c
+++ b/Modules/_io/winconsoleio.c
@@ -8,6 +8,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_object.h"
 
 #ifdef MS_WINDOWS
 
@@ -556,7 +557,7 @@
     Py_BEGIN_ALLOW_THREADS
     DWORD off = 0;
     while (off < maxlen) {
-        DWORD n = (DWORD)-1; 
+        DWORD n = (DWORD)-1;
         DWORD len = min(maxlen - off, BUFSIZ);
         SetLastError(0);
         BOOL res = ReadConsoleW(handle, &buf[off], len, &n, NULL);
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 48b4700..2cbf738 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -25,6 +25,7 @@
 
 #include "Python.h"
 #include "pycore_context.h"
+#include "pycore_object.h"
 #include "pycore_pymem.h"
 #include "pycore_pystate.h"
 #include "frameobject.h"        /* for PyFrame_ClearFreeList */