rework in part of text message entities

src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/CommonAbstracts/TextSource.kt

@@ -1,7 +1,17 @@
 package com.github.insanusmokrassar.TelegramBotAPI.CommonAbstracts
 
 interface TextSource {
-    val rawSource: String
     val asMarkdownSource: String
+    val asMarkdownV2Source: String
     val asHtmlSource: String
-}
+}
+
+
+interface MultilevelTextSource : TextSource {
+    val textParts: List<TextPart>
+}
+
+data class TextPart(
+    val range: IntRange,
+    val source: TextSource
+)