[Bug] Terraform provider attempts to recreate existing LiteLLM credentials, causing name conflict errors

[shivamrawat1]

Applying provider where we already have credentials existing in litellm causes provider to try to create credential anyway and fail due to conflict

Error: failed to create credential: API request failed: Status: 500 Internal Server Error, Response: {"error":{"message":"Internal Server Error, Unique constraint failed on the fields: (`credential_name`)","type":"internal_server_error","param":"None","code":"500"}}
│   with module.config.litellm_credential.aws_bedrock,
│   on modules/credentials.tf line 1, in resource "litellm_credential" "aws_bedrock":
│    1: resource "litellm_credential" "aws_bedrock" {

This is probably because of https://github.com/BerriAI/terraform-provider-litellm/blob/main/litellm/resource_credential.go#L18 forcing recreation. I would expect credential to be overriden on name conflict / removed before recreatedWhat is the recommended approach to using provider in context of credentials creation?