refactor(workspace): split workspace interface and implementation (#5463)

@affine/workspace -> (@affine/workspace, @affine/workspace-impl)

packages/frontend/workspace-impl/src/local/sync-sqlite.ts

@@ -0,0 +1,44 @@
+import { apis } from '@affine/electron-api';
+import type { SyncStorage } from '@affine/workspace';
+import { encodeStateVectorFromUpdate } from 'yjs';
+
+export function createSQLiteStorage(workspaceId: string): SyncStorage {
+  if (!apis?.db) {
+    throw new Error('sqlite datasource is not available');
+  }
+
+  return {
+    name: 'sqlite',
+    async pull(docId, _state) {
+      if (!apis?.db) {
+        throw new Error('sqlite datasource is not available');
+      }
+      const update = await apis.db.getDocAsUpdates(
+        workspaceId,
+        workspaceId === docId ? undefined : docId
+      );
+
+      if (update) {
+        return {
+          data: update,
+          state: encodeStateVectorFromUpdate(update),
+        };
+      }
+
+      return null;
+    },
+    async push(docId, data) {
+      if (!apis?.db) {
+        throw new Error('sqlite datasource is not available');
+      }
+      return apis.db.applyDocUpdate(
+        workspaceId,
+        data,
+        workspaceId === docId ? undefined : docId
+      );
+    },
+    async subscribe(_cb, _disconnect) {
+      return () => {};
+    },
+  };
+}