add extensions splitFor(Text|Caption) and fix captionLength

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt

@@ -55,7 +55,7 @@ val horizontalAccuracyLimit = 0F .. 1500F
 
 val getUpdatesLimit = 1 .. 100
 val callbackQueryAnswerLength = 0 until 200
-val captionLength = 0 .. 1024
+val captionLength = 0 .. 2048
 val textLength = 1 .. 4096
 val userProfilePhotosRequestLimit = 0 .. 100
 val chatTitleLength = 1 until 255

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/extensions/String.kt

@@ -1,5 +1,8 @@
 package dev.inmo.tgbotapi.utils.extensions
 
+import dev.inmo.tgbotapi.types.captionLength
+import dev.inmo.tgbotapi.types.textLength
+
 fun String.toMarkdown(): String {
     return replace(
         "*",
@@ -53,3 +56,6 @@ fun String.toHtml(): String = replace(
     "&",
     "&"
 )
+
+fun String.splitForText() = chunked(textLength.last)
+fun String.splitForCaption() = chunked(captionLength.last)