(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/common/DocActions.ts

@@ -79,6 +79,10 @@ export function isRenameTable(act: DocAction): act is RenameTable { return act[0
 const SCHEMA_ACTIONS = new Set(['AddTable', 'RemoveTable', 'RenameTable', 'AddColumn',
   'RemoveColumn', 'RenameColumn', 'ModifyColumn']);
 
+// Maps each data action to whether it's a bulk action.
+const DATA_ACTIONS = new Set(['AddRecord', 'RemoveRecord', 'UpdateRecord', 'BulkAddRecord',
+  'BulkRemoveRecord', 'BulkUpdateRecord', 'ReplaceTableData', 'TableData']);
+
 /**
  * Determines whether a given action is a schema action or not.
  */
@@ -87,6 +91,13 @@ export function isSchemaAction(action: DocAction):
   return SCHEMA_ACTIONS.has(action[0]);
 }
 
+export function isDataAction(action: DocAction):
+    action is AddRecord | RemoveRecord | UpdateRecord |
+              BulkAddRecord | BulkRemoveRecord | BulkUpdateRecord |
+              ReplaceTableData | TableDataAction {
+  return DATA_ACTIONS.has(action[0]);
+}
+
 /**
  * Returns the tableId from the action.
  */
@@ -149,6 +160,12 @@ export function getSelectionDesc(action: UserAction, optExcludeVals: boolean): s
   return `table ${table}, row${s} ${rows}; ${columns.join(", ")}`;
 }
 
+export function getNumRows(action: DocAction): number {
+  return !isDataAction(action) ? 0
+    : Array.isArray(action[2]) ? action[2].length
+    : 1;
+}
+
 // Convert from TableColValues (used by DocStorage and external APIs) to TableDataAction (used
 // mainly by the sandbox).
 export function toTableDataAction(tableId: string, colValues: TableColValues): TableDataAction {