move proxy implementations in their own file

Rearrange headers

src/tests/test-client.c

@@ -23,7 +23,7 @@
  */
 
 #include <pipewire/pipewire.h>
-#include <pipewire/client.h>
+#include <pipewire/impl-client.h>
 
 #define TEST_FUNC(a,b,func)	\
 do {				\

src/tests/test-context.c

@@ -23,8 +23,7 @@
  */
 
 #include <pipewire/pipewire.h>
-#include <pipewire/main-loop.h>
-#include <pipewire/context.h>
+#include <pipewire/global.h>
 
 #define TEST_FUNC(a,b,func)	\
 do {				\

src/tests/test-cpp.cpp

@@ -17,38 +17,8 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#include <pipewire/array.h>
-#include <pipewire/client.h>
-#include <pipewire/control.h>
-#include <pipewire/core.h>
-#include <pipewire/data-loop.h>
-#include <pipewire/device.h>
-#include <pipewire/factory.h>
-#include <pipewire/global.h>
-#include <pipewire/interfaces.h>
-#include <pipewire/introspect.h>
-#include <pipewire/link.h>
-#include <pipewire/log.h>
-#include <pipewire/loop.h>
-#include <pipewire/main-loop.h>
-#include <pipewire/map.h>
-#include <pipewire/mem.h>
-#include <pipewire/module.h>
-#include <pipewire/node.h>
-#include <pipewire/permission.h>
 #include <pipewire/pipewire.h>
-#include <pipewire/port.h>
-#include <pipewire/private.h>
-#include <pipewire/properties.h>
-#include <pipewire/protocol.h>
-#include <pipewire/proxy.h>
-#include <pipewire/core.h>
-#include <pipewire/resource.h>
-#include <pipewire/stream.h>
-#include <pipewire/thread-loop.h>
-#include <pipewire/type.h>
-#include <pipewire/utils.h>
-#include <pipewire/work-queue.h>
+#include <pipewire/impl.h>
 #include <extensions/client-node.h>
 #include <extensions/protocol-native.h>