add suport of unpinAllGeneralForumTopicMessages

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/forum/UnpinAllGeneralForumTopicMessages.kt

@@ -0,0 +1,14 @@
+package dev.inmo.tgbotapi.requests.chat.forum
+
+import dev.inmo.tgbotapi.types.*
+import kotlinx.serialization.*
+
+@Serializable
+data class UnpinAllGeneralForumTopicMessages (
+    @SerialName(chatIdField)
+    override val chatId: ChatIdentifier,
+): ModifyForumRequest {
+    override fun method(): String = "unpinAllGeneralForumTopicMessages"
+    override val requestSerializer: SerializationStrategy<*>
+        get() = serializer()
+}