feat(next-drupal): add NextDrupal and NextDrupalFetch class definitions

The DrupalClient class has been refactored to inherit from the NextDrupalFetch
(base class) and NextDrupal (JsonAPI/App Router class). DrupalClient class
contains the methods that are only needed to support Next.js' Pages Router.

The getPathFromContext() method has been replaced with the
constructPathFromSegment() method for App Router usages.

Issue #665

packages/next-drupal/src/draft-constants.ts

@@ -0,0 +1,4 @@
+export const DRAFT_DATA_COOKIE_NAME = "next_drupal_draft_data"
+
+// See https://vercel.com/docs/workflow-collaboration/draft-mode
+export const DRAFT_MODE_COOKIE_NAME = "__prerender_bypass"

packages/next-drupal/src/draft.ts

@@ -1,12 +1,15 @@
 import { cookies, draftMode } from "next/headers"
 import { redirect } from "next/navigation"
-import { DRAFT_DATA_COOKIE_NAME, DRAFT_MODE_COOKIE_NAME } from "./client"
+import {
+ DRAFT_DATA_COOKIE_NAME,
+ DRAFT_MODE_COOKIE_NAME,
+} from "./draft-constants"
 import type { NextRequest } from "next/server"
-import type { DrupalClient } from "./client"
+import type { NextDrupal } from "./next-drupal"
 
 export async function enableDraftMode(
  request: NextRequest,
- drupal: DrupalClient
+ drupal: NextDrupal
 ): Promise<Response | never> {
  // Validate the draft request.
  const response = await drupal.validateDraftUrl(request.nextUrl.searchParams)