Add behaviour-builder coverage for receiving Rich Messages

- onRichMessage trigger (ContentTriggers)
- waitRichMessage / waitRichMessageMessage expectations
- Flow<ContentMessage<*>>.onlyRichMessageContentMessages() util

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

tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/WaitContent.kt

@@ -66,6 +66,10 @@ fun BehaviourContext.waitStory(
     initRequest: Request<*>? = null,
     errorFactory: NullableRequestBuilder<*> = { null }
 ) = waitContent(initRequest, errorFactory).mapContent<StoryContent>()
+fun BehaviourContext.waitRichMessage(
+    initRequest: Request<*>? = null,
+    errorFactory: NullableRequestBuilder<*> = { null }
+) = waitContent(initRequest, errorFactory).mapContent<RichMessageContent>()
 fun BehaviourContext.waitVenue(
     initRequest: Request<*>? = null,
     errorFactory: NullableRequestBuilder<*> = { null }

tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/WaitContentMessage.kt

@@ -75,6 +75,10 @@ fun BehaviourContext.waitStoryMessage(
     initRequest: Request<*>? = null,
     errorFactory: NullableRequestBuilder<*> = { null }
 ) = waitContentMessage(initRequest, errorFactory).mapWithContent<StoryContent>()
+fun BehaviourContext.waitRichMessageMessage(
+    initRequest: Request<*>? = null,
+    errorFactory: NullableRequestBuilder<*> = { null }
+) = waitContentMessage(initRequest, errorFactory).mapWithContent<RichMessageContent>()
 fun BehaviourContext.waitVenueMessage(
     initRequest: Request<*>? = null,
     errorFactory: NullableRequestBuilder<*> = { null }

tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ContentTriggers.kt

@@ -304,6 +304,33 @@ fun <BC : BehaviourContext> BC.onStory(
     scenarioReceiver
 )
 
+/**
+ * @param initialFilter This filter will be called to remove unnecessary data BEFORE [scenarioReceiver] call
+ * @param subcontextUpdatesFilter This filter will be applied to each update inside of [scenarioReceiver]. For example,
+ * this filter will be used if you will call [dev.inmo.tgbotapi.extensions.behaviour_builder.expectations.waitContentMessage].
+ * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
+ * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
+ * to combinate several filters
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
+ * data
+ */
+fun <BC : BehaviourContext> BC.onRichMessage(
+    initialFilter: CommonMessageFilter<RichMessageContent>? = CommonMessageFilterExcludeMediaGroups,
+    subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, RichMessageContentMessage, Update>? = MessageFilterByChat,
+    markerFactory: MarkerFactory<in RichMessageContentMessage, Any>? = ByChatMessageMarkerFactory,
+    additionalSubcontextInitialAction: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, Update, RichMessageContentMessage>? = null,
+    scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, RichMessageContentMessage>
+) = onContentMessageWithType(
+    initialFilter,
+    subcontextUpdatesFilter,
+    markerFactory,
+    additionalSubcontextInitialAction,
+    scenarioReceiver
+)
+
 /**
  * @param initialFilter This filter will be called to remove unnecessary data BEFORE [scenarioReceiver] call
  * @param subcontextUpdatesFilter This filter will be applied to each update inside of [scenarioReceiver]. For example,