Rename pal_stat.h/cpp to pal_io.h/cpp

Rationale: grouping related functions that need to share constants

Author: nguerrera

src/Native/System.Native/CMakeLists.txt

@@ -3,7 +3,7 @@ project(System.Native)
 set(NATIVE_SOURCES
     pal_errno.cpp
     pal_exec.cpp
-    pal_stat.cpp
+    pal_io.cpp
     pal_uid.cpp
 )
 

src/Native/System.Native/pal_stat.cpp renamed to src/Native/System.Native/pal_io.cpp

@@ -2,7 +2,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 #include "../config.h"
-#include "pal_stat.h"
+#include "pal_io.h"
 #include <sys/stat.h>
 
 #if HAVE_STAT64