feat(driver): add base in-memory driver (graycoreio#3147)

Author: griest024

Diff for: libs/driver/in-memory/src/driver/base.class.ts

@@ -0,0 +1,16 @@
+import { InMemoryBackendConfigArgs } from 'angular-in-memory-web-api';
+
+/**
+ * The base class for in-memory drivers.
+ */
+export abstract class DaffInMemoryDriverBase {
+  /**
+   * The URL of the corresponding backend.
+   */
+  protected readonly url = `/${this.config.apiBase}/${this.collectionName}`;
+
+  constructor(
+    private config: InMemoryBackendConfigArgs,
+    private collectionName: string,
+  ) {}
+}

Diff for: libs/driver/in-memory/src/driver/public_api.ts

@@ -0,0 +1 @@
+export * from './base.class';

Diff for: libs/driver/in-memory/src/public_api.ts

@@ -1 +1,2 @@
 export * from './backend/public_api';
+export * from './driver/public_api';