add CombinedSubcontextInitialAction

tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/CombinedSubcontextInitialAction.kt

@@ -0,0 +1,53 @@
+package dev.inmo.tgbotapi.extensions.behaviour_builder
+
+import dev.inmo.kslog.common.KSLog
+import dev.inmo.kslog.common.error
+import dev.inmo.tgbotapi.types.update.abstracts.Update
+
+class CombinedSubcontextInitialAction(
+    val subactions: List<SubAction>,
+    private val logger: KSLog = KSLog("CombinedSubcontextInitialAction_${subactions.size}")
+) {
+    fun interface SubAction {
+        suspend operator fun BehaviourContext.invoke(update: Update)
+
+        class Callback(private val action: CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update>) : SubAction {
+            override suspend fun BehaviourContext.invoke(update: Update) {
+                action(update)
+            }
+        }
+    }
+    val subcontextInitialAction: CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update> = { update ->
+        subactions.forEach { subaction ->
+            with(subaction) {
+                runCatching {
+                    invoke(update)
+                }.onFailure {
+                    logger.error("Unable to execute $subaction for update $update", it)
+                }
+            }
+        }
+    }
+}
+
+inline fun buildSubcontextInitialActionWithSubActions(
+    block: MutableList<CombinedSubcontextInitialAction.SubAction>.() -> Unit
+): CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update> {
+    val list = mutableListOf<CombinedSubcontextInitialAction.SubAction>()
+    list.block()
+    return CombinedSubcontextInitialAction(
+        list.toList()
+    ).subcontextInitialAction
+}
+
+inline fun buildSubcontextInitialAction(
+    block: MutableList<CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update>>.() -> Unit
+): CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update> {
+    val list = mutableListOf<CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update>>()
+    list.block()
+    return CombinedSubcontextInitialAction(
+        list.map {
+            CombinedSubcontextInitialAction.SubAction.Callback(it)
+        }
+    ).subcontextInitialAction
+}