Make forwardDims() optional and handle data dependency & moved several operators impl to core

See aidge_core!104 (merged).

aidge_backend_cpu/unit_tests/test_recipes.py

@@ -40,7 +40,7 @@ class test_recipes(unittest.TestCase):
         graph_view.set_backend("cpu")
 
         np_weights = np.arange(9).reshape([1, 1, 3, 3]).astype(np.float32)
-        np_bias = np.arange(1).reshape([1, 1]).astype(np.float32)
+        np_bias = np.arange(1).reshape([1]).astype(np.float32)
 
         np_scale = np.array([0.05]).astype(np.float32)
         np_shift = np.array([0.05]).astype(np.float32)