Function get_api_key 

pub async fn get_api_key(
    __arg0: State<App>,
    tn_id: TnId,
    __arg2: IdTag,
    __arg3: Path<i32>,
    __arg4: Query<ApiKeyIdTagQuery>,
    __arg5: OptionalRequestId,
) -> ClResult<(StatusCode, Json<ApiResponse<ApiKeyResponse>>)>

GET /api/idp/api-keys/{api_key_id} - Get a specific API key by ID