[FEATURE] Add support for Azure Speech-To-Text custom endpoint

Describe the feature you'd like Currently is possible to enable the Azure STT standard endpoint. Supporting a custom endpoint will enable the usage of Azure STT tailored for specific languages (dialects, engineering, healthcare, etc)

Additional context Calling the custom endpoint require this code var config = SpeechSDK.SpeechConfig.fromSubscription("YourSubscriptionKey", "YourServiceRegion"); config.endpointId = "YourEndpointId"; var reco = new SpeechSDK.SpeechRecognizer(config);

Where YourSubscriptionKey and YourServiceRegion parameters are already available in Flowise configuration, what is missing is the YourEndpointId