* Add speech to text example in docs
* Add caption formats for audio transcription
* Add caption example to README
* Address sanity check errors
* Add tests for decodeResponse
* Use typechecker for audio response format
* Decoding response refactors
* add form builder
* cover VariImage
* test for closing errors
* simplify tests
* add audio api test coverage
* don't leak authToken when printed
* rename api->client
* fix test
* Compatible with the situation where the mask is empty in CreateEditImage.
* Fix the test for the unnecessary removal of the mask.png file.
* add image variation implementation
* fix image variation bugs
* fix ci-lint problem with max line character limit
* add offitial doc link
* just for codeball test
* fix lint problem
* add optional params for audio api, e.g. prompt
* add comment for new args in translation
