bpo-35081: Rename internal headers (GH-10275)

Rename Include/internal/ headers:

* pycore_hash.h -> pycore_pyhash.h
* pycore_lifecycle.h -> pycore_pylifecycle.h
* pycore_mem.h -> pycore_pymem.h
* pycore_state.h -> pycore_pystate.h

Add missing headers to Makefile.pre.in and PCbuild:

* pycore_condvar.h.
* pycore_hamt.h
* pycore_pyhash.h
diff --git a/Include/pystate.h b/Include/pystate.h
index b30c318..58499ea 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -301,7 +301,7 @@
 /* Get the current Python thread state.
 
    Macro using PyThreadState_Get() or _PyThreadState_GET() depending if
-   pycore_state.h is included or not (this header redefines the macro).
+   pycore_pystate.h is included or not (this header redefines the macro).
 
    If PyThreadState_Get() is used, issue a fatal error if the current thread
    state is NULL.