[WIP] Grid problem prerequisites for Clifford+T decompositions

pennylane/ops/op_math/decompositions/grid_problems.py

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+# Copyright 2018-2025 Xanadu Quantum Technologies Inc.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Contains 1-D and 2-D grid problem solving utilities."""
+
+
+# pylint: disable=too-few-public-methods
+class Ellipse:
+    """A class representing an ellipse in a 2D grid problem.
+
+    Args:
+        center (tuple[float, float]): The center of the ellipse (x, y).
+        axes (tuple[float, float]): The lengths of the semi-major and semi-minor axes (a, b).
+        angle (float): The rotation angle of the ellipse in radians.
+    """
+
+    def __init__(self, center, axes, angle):
+        self.center = center
+        self.axes = axes
+        self.angle = angle