@spec create(ExPlain.Client.t(), map()) ::
  {:ok, ExPlain.Webhooks.WebhookTarget.t()} | {:error, ExPlain.Error.t()}

Creates a new webhook target.

The input map must include :url and :event_subscriptions (list of %{event_type: "..."} maps). Optional: :description, :is_enabled.

@spec delete(ExPlain.Client.t(), String.t()) ::
  {:ok, :deleted} | {:error, ExPlain.Error.t()}

Deletes a webhook target.

@spec get_by_id(ExPlain.Client.t(), String.t()) ::
  {:ok, ExPlain.Webhooks.WebhookTarget.t() | nil} | {:error, ExPlain.Error.t()}

Fetches a webhook target by its Plain ID. Returns {:ok, nil} if not found.

@spec list(
  ExPlain.Client.t(),
  keyword()
) ::
  {:ok,
   %{
     nodes: [ExPlain.Webhooks.WebhookTarget.t()],
     page_info: ExPlain.PageInfo.t()
   }}
  | {:error, ExPlain.Error.t()}

Returns a paginated list of webhook targets.

@spec update(ExPlain.Client.t(), map()) ::
  {:ok, ExPlain.Webhooks.WebhookTarget.t()} | {:error, ExPlain.Error.t()}

Updates a webhook target.