GH-91079: Rename C_RECURSION_LIMIT to Py_C_RECURSION_LIMIT (#108507)

Symbols of the C API should be prefixed by "Py_" to avoid conflict
with existing names in 3rd party C extensions on "#include <Python.h>".

test.pythoninfo now logs Py_C_RECURSION_LIMIT constant and other
_testcapi and _testinternalcapi constants.

Lib/test/pythoninfo.py

@@ -665,6 +665,22 @@ def collect_decimal(info_add):
 
 
 def collect_testcapi(info_add):
+    try:
+        import _testcapi
+    except ImportError:
+        return
+
+    for name in (
+        'LONG_MAX',         # always 32-bit on Windows, 64-bit on 64-bit Unix
+        'PY_SSIZE_T_MAX',
+        'Py_C_RECURSION_LIMIT',
+        'SIZEOF_TIME_T',    # 32-bit or 64-bit depending on the platform
+        'SIZEOF_WCHAR_T',   # 16-bit or 32-bit depending on the platform
+    ):
+        copy_attr(info_add, f'_testcapi.{name}', _testcapi, name)
+
+
+def collect_testinternalcapi(info_add):
     try:
         import _testinternalcapi
     except ImportError:
@@ -672,6 +688,12 @@ def collect_testcapi(info_add):
 
     call_func(info_add, 'pymem.allocator', _testinternalcapi, 'pymem_getallocatorsname')
 
+    for name in (
+        'SIZEOF_PYGC_HEAD',
+        'SIZEOF_PYOBJECT',
+    ):
+        copy_attr(info_add, f'_testinternalcapi.{name}', _testinternalcapi, name)
+
 
 def collect_resource(info_add):
     try:
@@ -907,6 +929,7 @@ def collect_info(info):
         collect_sys,
         collect_sysconfig,
         collect_testcapi,
+        collect_testinternalcapi,
         collect_time,
         collect_tkinter,
         collect_windows,