Increase image.go test coverage to 100% (#1039)

Add support for Chat Completion Service Tier (#1023)

* Add support for Chat Completion Service Tier

* Add priority service tier

Fix for removing usage in every stream chunk response. (#1022)

* Fix for #1021:
1. Make Usage field in completions Response to pointer.

* Fix for #1021:
1. Make Usage field in completions Response to pointer.
2. Add omitempty to json tag

Signed-off-by: Hritik003 <hritik.raj@nutanix.com>

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Signed-off-by: Hritik003 <hritik.raj@nutanix.com>

fix image api missing filename bug (#1017)

* fix image api missing filename bug

* add test

* add test

* update test

skip json field (#1009)

* skip json field

* backfill some coverage and tests

fix lint (#998)

Upgrade golangci-lint to 2.1.5 (#986)

* Upgrade golangci-lint to 2.1.5

* update action

Add Prediction field (#970)

* Add Prediction field to ChatCompletionRequest

* Include prediction tokens in response

feat: Add missing TTS models and voices (#958)

* feat: Add missing TTS models and voices

* feat: Add new instruction field to create speech request

- From docs: Control the voice of your generated audio with additional instructions. Does not work with tts-1 or tts-1-hd.

* fix: add canary-tts back to SpeechModel

add enum tag to jsonschema (#962)

* fix jsonschema tests

* ensure all run during PR Github Action

* add test for struct to schema

* add support for enum tag

* support nullable tag