(core) move home server into core

Summary: This moves enough server material into core to run a home server.  The data engine is not yet incorporated (though in manual testing it works when ported).

Test Plan: existing tests pass

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2552

app/server/lib/ITestingHooks.ts

@@ -0,0 +1,20 @@
+import {UserProfile} from 'app/common/LoginSessionAPI';
+
+export interface ITestingHooks {
+  getOwnPort(): number;
+  getPort(): number;
+  updateAuthToken(instId: string, authToken: string): Promise<void>;
+  getAuthToken(instId: string): Promise<string|null>;
+  useTestToken(instId: string, token: string): Promise<void>;
+  setLoginSessionProfile(gristSidCookie: string, profile: UserProfile|null, org?: string): Promise<void>;
+  setServerVersion(version: string|null): Promise<void>;
+  disconnectClients(): Promise<void>;
+  commShutdown(): Promise<void>;
+  commRestart(): Promise<void>;
+  commSetClientPersistence(ttlMs: number): Promise<void>;
+  closeDocs(): Promise<void>;
+  setDocWorkerActivation(workerId: string, active: 'active'|'inactive'|'crash'): Promise<void>;
+  flushAuthorizerCache(): Promise<void>;
+  getDocClientCounts(): Promise<Array<[string, number]>>;
+  setActiveDocTimeout(seconds: number): Promise<number>;
+}