handle/managed: Implement non-copyable handle

This is a generic handle type that holds a resource and uses RAII to
call a user defined function when the resource is destroyed. A future
change will implement a smart file descriptor based on this interface.

A follow up change will implement the copyable version.

Tested:
    Built and run through unit tests.

Change-Id: Ia8da1d662319e8fb58380ed4979bcf1b74f66dfb
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/meson.build b/test/meson.build
index b918d5d..812de29 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -3,6 +3,7 @@
 
 tests = [
   'signal',
+  'handle/managed',
 ]
 
 foreach t : tests