(core) Checks that an ACL formula can be parsed, and prevent saving unparsable ACL rules.

Summary:
- Fix error-handling in bundleActions(), and wait for the full bundle to complete.
  (The omissions here were making it impossibly to react to errors from inside bundleActions())
- Catch problematic rules early enough to undo them, by trying out ruleCollection.update()
  on updated rules before the updates are applied.
- Added checkAclFormula() call to DocComm that checks parsing and compiling
  formula, and reports errors.
- In UI, prevent saving if any aclFormulas are invalid, or while waiting for the to get checked.

- Also fixed some lint errors

Test Plan: Added a test case of error reporting in ACL formulas.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2689

app/server/lib/Sharing.ts

@@ -19,7 +19,7 @@ import {WorkCoordinator} from './WorkCoordinator';
 // processing hub actions or rebasing.
 interface UserRequest {
   action: UserActionBundle;
-  docSession: OptDocSession|null,
+  docSession: OptDocSession|null;
   resolve(result: UserResult): void;
   reject(err: Error): void;
 }