refactor: align delta's string representation with java-diff

Author: lppedd

src/commonMain/kotlin/io/github/petertrr/diffutils/patch/ChangeDelta.kt

@@ -50,4 +50,7 @@ public data class ChangeDelta<T>(
 
     override fun withChunks(original: Chunk<T>, revised: Chunk<T>): Delta<T> =
         ChangeDelta(original, revised)
+
+    override fun toString(): String =
+        "[ChangeDelta, position: ${source.position}, lines: ${source.lines} to ${target.lines}]"
 }

src/commonMain/kotlin/io/github/petertrr/diffutils/patch/DeleteDelta.kt

@@ -41,4 +41,7 @@ public data class DeleteDelta<T>(
 
     override fun withChunks(original: Chunk<T>, revised: Chunk<T>): Delta<T> =
         DeleteDelta(original, revised)
+
+    override fun toString(): String =
+        "[DeleteDelta, position: ${source.position}, lines: ${source.lines}]"
 }

src/commonMain/kotlin/io/github/petertrr/diffutils/patch/EqualDelta.kt

@@ -32,4 +32,7 @@ public data class EqualDelta<T>(
 
     override fun withChunks(original: Chunk<T>, revised: Chunk<T>): Delta<T> =
         EqualDelta(original, revised)
+
+    override fun toString(): String =
+        "[EqualDelta, position: ${source.position}, lines: ${source.lines}]"
 }

src/commonMain/kotlin/io/github/petertrr/diffutils/patch/InsertDelta.kt

@@ -41,4 +41,7 @@ public data class InsertDelta<T>(
 
     override fun withChunks(original: Chunk<T>, revised: Chunk<T>): Delta<T> =
         InsertDelta(original, revised)
+
+    override fun toString(): String =
+        "[InsertDelta, position: ${source.position}, lines: ${target.lines}]"
 }