Update api spec (#439)

* YOYO NEW API SPEC!

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kittycad/models/relative_to.py

@@ -0,0 +1,13 @@
+from enum import Enum
+
+
+class RelativeTo(str, Enum):
+    """What is the given geometry relative to?"""  # noqa: E501
+
+    """# Local/relative to a position centered within the plane being sketched on """  # noqa: E501
+    SKETCH_PLANE = "sketch_plane"
+    """# Local/relative to the trajectory curve """  # noqa: E501
+    TRAJECTORY_CURVE = "trajectory_curve"
+
+    def __str__(self) -> str:
+        return str(self.value)