Fix RichTextBotCommand SerialName to bot_command

RichTextBotCommand.botCommand reused botCommandField ("command", shared
with BotCommand.command) but Bot API docs require "bot_command". Add
botCommandFullField = "bot_command" and switch RichTextBotCommand to it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -463,6 +463,7 @@ const val inputMessageContentField = "input_message_content"
 const val hideUrlField = "hide_url"
 
 const val botCommandField = "command"
+const val botCommandFullField = "bot_command"
 const val botCommandsField = "commands"
 const val scopeField = "scope"
 

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/rich/RichTextEntities.kt

@@ -4,7 +4,7 @@ import dev.inmo.tgbotapi.types.CustomEmojiId
 import dev.inmo.tgbotapi.types.alternativeTextField
 import dev.inmo.tgbotapi.types.anchorNameField
 import dev.inmo.tgbotapi.types.bankCardNumberField
-import dev.inmo.tgbotapi.types.botCommandField
+import dev.inmo.tgbotapi.types.botCommandFullField
 import dev.inmo.tgbotapi.types.cashtagField
 import dev.inmo.tgbotapi.types.chat.User
 import dev.inmo.tgbotapi.types.customEmojiIdField
@@ -436,7 +436,7 @@ data class RichTextCashtag(
 data class RichTextBotCommand(
     @SerialName(textField)
     val text: RichText,
-    @SerialName(botCommandField)
+    @SerialName(botCommandFullField)
     val botCommand: String
 ) : RichTextEntity {
     @EncodeDefault