LibDebug: Move everything into the "Debug" namespace

Author: https://github.com/Lubrsi
Commit: 694b86a4bf
Pull-request: https://github.com/SerenityOS/serenity/pull/3290

Libraries/LibDebug/DebugSession.cpp

@@ -28,6 +28,8 @@
 #include <AK/Optional.h>
 #include <stdlib.h>
 
+namespace Debug {
+
 DebugSession::DebugSession(int pid)
     : m_debugee_pid(pid)
     , m_executable(initialize_executable_mapped_file(pid))
@@ -263,3 +265,5 @@ void* DebugSession::single_step()
     set_registers(regs);
     return (void*)regs.eip;
 }
+
+}