(core) Add LogMethods helper and use it for more JSON data in logs. Reduce unhelpful logging.

Summary:
- Sharing, Client, DocClients, HostingStorageManager all include available info.
- In HostingStorageManager, log numSteps and maxStepTimeMs, in case that helps
  debug SQLITE_BUSY problem.
- Replace some action-bundle logging with a JSON version aggregating some info.
- Skip logging detailed list of actions in production.

Test Plan: Tested manually by eyeballing log output in dev environment.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3086

app/server/lib/serverUtils.ts

@@ -8,7 +8,7 @@ import * as uuidv4 from 'uuid/v4';
 import {EngineCode} from 'app/common/DocumentSettings';
 import * as log from 'app/server/lib/log';
 import { OpenMode, SQLiteDB } from 'app/server/lib/SQLiteDB';
-import { getDocSessionAccess, getDocSessionUser, OptDocSession } from './DocSession';
+import { getDocSessionAccessOrNull, getDocSessionUser, OptDocSession } from './DocSession';
 
 /**
  * Promisify a node-style callback function. E.g.
@@ -142,7 +142,7 @@ export async function checkAllegedGristDoc(docSession: OptDocSession, fname: str
  */
 export function getLogMetaFromDocSession(docSession: OptDocSession) {
   const client = docSession.client;
-  const access = getDocSessionAccess(docSession);
+  const access = getDocSessionAccessOrNull(docSession);
   const user = getDocSessionUser(docSession);
   return {
     access,