Expose `PathBuilder.offset` and `PathBuilder.transform` in Kotlin API (#1169)

[SKIKO-1112](https://youtrack.jetbrains.com/issue/SKIKO-1112) Missed
`PathBuilder.offset` and `PathBuilder.transform` in `0.144.0`

Missed part from #1154
JNI/KN C++ bindings are already in place

skiko/src/commonMain/kotlin/org/jetbrains/skia/PathBuilder.kt

@@ -782,6 +782,42 @@ class PathBuilder internal constructor(ptr: NativePointer) : Managed(ptr, _Final
         }
     }
 
+    /**
+     * Offsets all points in this builder by (dx, dy).
+     *
+     * @param dx offset on x-axis
+     * @param dy offset on y-axis
+     * @return this builder for chaining
+     */
+    fun offset(dx: Float, dy: Float): PathBuilder {
+        return try {
+            Stats.onNativeCall()
+            PathBuilder_nOffset(_ptr, dx, dy)
+            this
+        } finally {
+            reachabilityBarrier(this)
+        }
+    }
+
+    /**
+     * Transforms this builder by matrix.
+     *
+     * @param matrix transform to apply
+     * @return this builder for chaining
+     */
+    fun transform(matrix: Matrix33): PathBuilder {
+        return try {
+            Stats.onNativeCall()
+            interopScope {
+                PathBuilder_nTransform(_ptr, toInterop(matrix.mat))
+            }
+            this
+        } finally {
+            reachabilityBarrier(this)
+            reachabilityBarrier(matrix)
+        }
+    }
+
     /**
      * Sets last point to (x, y).
      * 
@@ -901,3 +937,9 @@ private external fun PathBuilder_nAddPathTransform(ptr: NativePointer, srcPtr: N
 
 @ExternalSymbolName("org_jetbrains_skia_PathBuilder__1nSetLastPt")
 private external fun PathBuilder_nSetLastPt(ptr: NativePointer, x: Float, y: Float)
+
+@ExternalSymbolName("org_jetbrains_skia_PathBuilder__1nOffset")
+private external fun PathBuilder_nOffset(ptr: NativePointer, dx: Float, dy: Float)
+
+@ExternalSymbolName("org_jetbrains_skia_PathBuilder__1nTransform")
+private external fun PathBuilder_nTransform(ptr: NativePointer, matrix: InteropPointer)

skiko/src/commonTest/kotlin/org/jetbrains/skia/PathBuilderTest.kt

@@ -366,6 +366,25 @@ class PathBuilderTest {
         assertEquals(Point(10f, 10f), path3.getPoint(0))
     }
 
+    @Test
+    fun testOffsetAndTransform() {
+        val offsetPath = PathBuilder()
+            .moveTo(1f, 2f)
+            .lineTo(3f, 4f)
+            .offset(5f, 6f)
+            .detach()
+        assertEquals(Point(6f, 8f), offsetPath.getPoint(0))
+        assertEquals(Point(8f, 10f), offsetPath.getPoint(1))
+
+        val transformedPath = PathBuilder()
+            .moveTo(1f, 2f)
+            .lineTo(3f, 4f)
+            .transform(Matrix33.makeScale(2f, 3f))
+            .detach()
+        assertEquals(Point(2f, 6f), transformedPath.getPoint(0))
+        assertEquals(Point(6f, 12f), transformedPath.getPoint(1))
+    }
+
     @Test
     fun testSetLastPt() {
         val path = PathBuilder()