build: Port geometry and quadtree packages to Kotlin (#1569)

* Rename .java to .kt

* feat(library): Port PointQuadTree and tests to Kotlin

This commit migrates the `PointQuadTree` class and its corresponding test, `PointQuadTreeTest`, from Java to idiomatic Kotlin.

This conversion modernizes the codebase, improving its conciseness, readability, and null safety.

The key changes are:
- **`PointQuadTree` to Kotlin**: The core `PointQuadTree` class has been rewritten in Kotlin, leveraging features like primary constructors, companion objects, and stricter nullability.
- **`PointQuadTreeTest` to Kotlin**: The associated test class has also been ported to Kotlin, resulting in more streamlined test code.
- **Copyright Header Update**: The copyright year has been updated in the converted files.

* Rename .java to .kt

* refactor(geometry): Port Point and Bounds classes to Kotlin

This commit modernizes the `Point` and `Bounds` classes by converting them from Java to idiomatic Kotlin. This change improves code conciseness, readability, and null safety.

Key changes include:
- The `Point` and `Bounds` classes are now written in Kotlin.
- `@JvmField` annotations are used on properties to maintain binary compatibility for Java consumers.
- New unit tests, `PointTest.kt` and `BoundsTest.kt`, have been added to ensure the correctness of the ported classes.

* feat: added headers

---------

Co-authored-by: Enrique López Mañas <[email protected]>

Author: dkhawk

library/src/main/java/com/google/maps/android/geometry/Bounds.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * 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.
+ */
+
+
+package com.google.maps.android.geometry
+
+/**
+ * Represents an area in the cartesian plane.
+ */
+class Bounds(
+    @JvmField val minX: Double,
+    @JvmField val maxX: Double,
+    @JvmField val minY: Double,
+    @JvmField val maxY: Double
+) {
+    @JvmField
+    val midX: Double = (minX + maxX) / 2
+
+    @JvmField
+    val midY: Double = (minY + maxY) / 2
+
+    fun contains(x: Double, y: Double): Boolean {
+        return minX <= x && x <= maxX && minY <= y && y <= maxY
+    }
+
+    fun contains(point: Point): Boolean {
+        return contains(point.x, point.y)
+    }
+
+    fun intersects(minX: Double, maxX: Double, minY: Double, maxY: Double): Boolean {
+        return minX < this.maxX && this.minX < maxX && minY < this.maxY && this.minY < maxY
+    }
+
+    fun intersects(bounds: Bounds): Boolean {
+        return intersects(bounds.minX, bounds.maxX, bounds.minY, bounds.maxY)
+    }
+
+    fun contains(bounds: Bounds): Boolean {
+        return bounds.minX >= minX && bounds.maxX <= maxX && bounds.minY >= minY && bounds.maxY <= maxY
+    }
+}

library/src/main/java/com/google/maps/android/geometry/Bounds.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025 Google LLC.
+ *
+ * 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.
+ */
+
+package com.google.maps.android.geometry
+
+open class Point(@JvmField val x: Double, @JvmField val y: Double) {
+    override fun toString(): String {
+        return "Point(x=$x, y=$y)"
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Point
+
+        if (x != other.x) return false
+        if (y != other.y) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = x.hashCode()
+        result = 31 * result + y.hashCode()
+        return result
+    }
+
+    fun copy(x: Double = this.x, y: Double = this.y): Point {
+        return Point(x, y)
+    }
+}