Add missing changelog

changelog.d/20221104_145601_sirosen_add_scope_parsing.rst

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+* Enhance scope utilities with scope parsing, attached to
+  ``globus_sdk.scopes.Scope`` (:pr:`NUMBER`)
+
+  * ``MutableScope`` has been renamed to ``Scope``. Both names remain available
+    for backwards compatibility, but the preferred name is now ``Scope``
+
+  * ``Scope.parse`` and ``Scope.deserialize`` can now be used to parse strings
+    into ``Scope``\s
+
+  * ``Scope(...).serialize()`` is added, and ``str(Scope(...))`` uses it
+
+  * ``Scope.add_dependency`` now supports ``Scope`` objects as inputs
+
+  * The ``optional`` argument to ``add_dependency`` is deprecated.
+    ``Scope(...).add_dependency("*foo")`` can be used to add an optional
+    dependency as a string, or equivalently
+    ``Scope(...).add_dependency(Scope("foo", optional=True))``