feat: add warning messages when getting deleted promp

[Matthieu-OD]

To test

• get or create or get prompt version or prompt lineage where the prompt lineage has been deleted which means that the value of the field deletedAt is not null

after adding the dev version of the repo as a dependency you can use this code to test it

from literalai import LiteralClient

literalai_client = LiteralClient(
    url="http://localhost:3000", api_key="my-initial-api-key"
)

def get_prompt():
    prompt = literalai_client.api.get_prompt(name="Default", version=2)
    prompt2 = literalai_client.api.get_or_create_prompt(
        name="Default", template_messages=[]
    )
    prompt_lineage = literalai_client.api.get_or_create_prompt_lineage(name="Default")
    print("prompt", prompt)
    print("prompt2", prompt2)
    print("prompt lineage", prompt_lineage)

if __name__ == "__main__":
    get_prompt()