Prompt Fetching

[Andrew Kent (realark)]

• Add Braintrust utility as a convenient main entry point to the SDK
• Prompt fetching API (https://www.braintrust.dev/docs/platform/functions/prompts#fetching-in-code)

Example:

{ // simple example
    var prompt = braintrust.promptLoader().load("kind-greeter-69d2");
    var response =
            openAIClient
                    .chat()
                    .completions()
                    .create(
                            buildChatCompletionsPrompt(
                                    prompt, Map.of("name", "Sam Malone")));
    System.out.println("got response: %s".formatted(response.choices().get(0).message()));
}
{ // more complex prompt options
    var prompt =
            braintrust
                    .promptLoader()
                    .load(
                            PromptLoadRequest.builder()
                                    .projectName("andrew-misc")
                                    .promptSlug("unkind-greeter-fd4c")
                                    .version("cbbc711da9f7d445")
                                    .defaults("model", "gpt-3.5-turbo")
                                    .build());
    var response =
            openAIClient
                    .chat()
                    .completions()
                    .create(
                            buildChatCompletionsPrompt(
                                    prompt, Map.of("name", "Frasier Crane")));
    System.out.println("got response: %s".formatted(response));
}