Start Speech Synthesis Task
POST {{aws_polly_base_url}}/v1/synthesisTasks
Request Body
{"Engine"=>"string", "LanguageCode"=>"string", "LexiconNames"=>["string"], "OutputFormat"=>"string", "OutputS3BucketName"=>"string", "OutputS3KeyPrefix"=>"string", "SampleRate"=>"string", "SnsTopicArn"=>"string", "SpeechMarkTypes"=>["string"], "Text"=>"string", "TextType"=>"string", "VoiceId"=>"string"}