Add asinh acosh atanh extractors (#1600)

* Add asinh acosh atanh extractors

* Add asinh acosh atanh ext for tf

* Update docs

model-optimizer/extensions/ops/activation_ops.py

@@ -65,6 +65,11 @@ class Asin(Activation):
     operation = staticmethod(lambda x: np.arcsin(x))
 
 
+class Asinh(Activation):
+    op = 'Asinh'
+    operation = staticmethod(lambda x: np.arcsinh(x))
+
+
 class Cos(Activation):
     op = 'Cos'
     operation = staticmethod(lambda x: np.cos(x))
@@ -80,6 +85,11 @@ class Acos(Activation):
     operation = staticmethod(lambda x: np.arccos(x))
 
 
+class Acosh(Activation):
+    op = 'Acosh'
+    operation = staticmethod(lambda x: np.arccosh(x))
+
+
 class Tan(Activation):
     op = 'Tan'
     operation = staticmethod(lambda x: np.tan(x))
@@ -95,6 +105,11 @@ class Atan(Activation):
     operation = staticmethod(lambda x: np.arctan(x))
 
 
+class Atanh(Activation):
+    op = 'Atanh'
+    operation = staticmethod(lambda x: np.arctanh(x))
+
+
 class ReLU6(AttributedClamp):
     op = 'ReLU6'