For ONVIF TTS audio proposal, to support device with TTS function

[Peggy0422]

To support audio device with TTS function, several operations should be done, which are:

TTSCapabilities(Optional): Add complex type TTSCapabilities to the existing complex Type "AudioClipCapabilities" as optional, to indicate whether the device is capable of TTS function and the detailed configuration if so.
Parameter:

1. MaxContentLength: the max length of the content in a text that device could convert into an audio clip;
2. TTSLanguage: indicates what languages the device supports in TTS.
3. TTSVoiceType: indicates what types of voice that the device supports in TTS.

Add “AddTTSAudioClip”and "AddTTSAudioClipResponse"element: To send a text, corresponding TTS configuration and audio clip configuration to device, for device converting the text to an audio clip based on the TTS configuration, and play it according to audio clip configuration in the future.
Parameter:

1. Token(Optional): token for the audio clip.
2. Configuration: audio clip configuration to add, reference to Configuration for AddAudioClip.
3. TTSConfiguration: the configuration for the TTS audio clip to add, it specifies the audio content, language and voice type when device play this audio clip.
   Reponse:
4. Token: Unique token of the TTS audio clip to be uploaded.

media2.wsdl

1. Added AddTTSAudioClip request and AddTTSAudioClip response for sending a text, audio clip configuration, TTS configuration to the device;
2. Added complex types "TTSAudio" for TTSConfiguration to support TTS function. It includes parameters: Content, Language, VoiceType.
3. Updated AudioClipCapabilities with TTSCapabilities, and added complex types for TTSCapabilities to indicate the device supports TTS function and its corresponding configuration. Complex types TTSCapabilities includes MaxContentLength, TTSLanguage and TTSVoiceType.
4. Added simpleType TTSLanguage and TTSVoiceType.

media2.xml and documentation

1. Added detailed descriptions for AddTTSAudioClip operations, explaining their purpose, parameters, and responses.
2. Updated audio clip Capabilities with TTSCapabilities.
   ONVIF-Media2-Service-Spec-TTS update.docx

[ocampana-videotec]

@Peggy0422 shoudl we close this and just refer to #694 ?