Add support for making Text-To-Speech send regular text messages instead of notices

When speech-to-text/flow-type = `only_transcribe`, the bot will now send
text messages by default, not notices.

While notice messages may be less desirable with other bots in the room,
it's probably a better default for most people who enable "transcribe-only" mode.

This is an improvement related to https://github.com/etkecc/baibot/issues/14

src/entity/roomconfig/defaults.rs

@@ -1,4 +1,4 @@
-use super::SpeechToTextFlowType;
+use super::{SpeechToTextFlowType, SpeechToTextMessageTypeForNonThreadedOnlyTranscribedMessages};
 use super::{TextGenerationAutoUsage, TextGenerationPrefixRequirementType};
 use super::{TextToSpeechBotMessagesFlowType, TextToSpeechUserMessagesFlowType};
 
@@ -15,3 +15,9 @@ pub const TEXT_TO_SPEECH_USER_MESSAGES_FLOW_TYPE: TextToSpeechUserMessagesFlowTy
 
 pub const SPEECH_TO_TEXT_FLOW_TYPE: SpeechToTextFlowType =
     SpeechToTextFlowType::TranscribeAndGenerateText;
+
+// While notice messages may be less desirable with other bots in the room,
+// it's probably a better default for most people who enable "transcribe-only" mode.
+pub const SPEECH_TO_TEXT_ONLY_TRANSCRIBE_NON_THREADED_MESSAGE_TYPE:
+    SpeechToTextMessageTypeForNonThreadedOnlyTranscribedMessages =
+    SpeechToTextMessageTypeForNonThreadedOnlyTranscribedMessages::Text;