Optimizer interface and sample implementation (#19)

Reviewed-on: Rubydragon/MetagraphOptimization.jl#19
Co-authored-by: Anton Reinhard <anton.reinhard@proton.me>
Co-committed-by: Anton Reinhard <anton.reinhard@proton.me>

notebooks/abc_model_large.ipynb

@@ -99,8 +99,7 @@
     }
    ],
    "source": [
-    "include(\"../examples/profiling_utilities.jl\")\n",
-    "@time reduce_all!(graph)\n",
+    "@time optimize_to_fixpoint!(ReductionOptimizer(), graph)\n",
     "print(graph)"
    ]
   },

notebooks/abc_model_showcase.ipynb

@@ -211,10 +211,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "include(\"../examples/profiling_utilities.jl\")\n",
-    "\n",
     "# We can also mute the graph by applying some operations to it\n",
-    "reduce_all!(graph)"
+    "optimize_to_fixpoint!(ReductionOptimizer(), graph)"
    ]
   },
   {

notebooks/profiling.ipynb

@@ -30,8 +30,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "include(\"../examples/profiling_utilities.jl\")\n",
-    "@ProfileView.profview reduce_all!(graph)"
+    "@ProfileView.profview optimize_to_fixpoint!(ReductionOptimizer(), graph)"
    ]
   },
   {