Restore Geometry.h with a deprecation message

Summary:
In [this commit](facebook@e6cba99), we renamed `Geometry.h` to `Vector.h`.
This is the last change of a series of updates that progressively altered the shape of `Geometry.h` from its [original version](https://github.com/facebook/react-native/blob/0.71-stable/ReactCommon/react/renderer/graphics/Geometry.h).

This is a breaking change as several libraries in the OSS are depending on Geometry.h and we removed it without deprecating it.
This change aims to put the file back, with a deprecation message, so that we can safely remove it in the next version.

## Changelog
[General][Fixed] - Restore Geometry.h to avoid breaking change

Reviewed By: cortinico

Differential Revision: D43621983

fbshipit-source-id: 96b976901f7ec337f2ec64c592e4b4d19d89ab11

Author: cipolleschi

ReactCommon/react/renderer/graphics/Geometry.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <react/renderer/graphics/Float.h>
+#include <react/renderer/graphics/Point.h>
+#include <react/renderer/graphics/Rect.h>
+#include <react/renderer/graphics/RectangleCorners.h>
+#include <react/renderer/graphics/RectangleEdges.h>
+#include <react/renderer/graphics/Size.h>
+#include <react/renderer/graphics/Vector.h>
+
+#warning \
+    "The Geometry.h file is deprecated and will be removed in the next version of React Native. Please update your #include and #import statements to use the specific files. For example, if you imported Geometry.h to use Float.h, replase the #include <react/renderer/graphics/Geometry.h> with #include <react/renderer/graphics/Float.h>"