(core) Add new UI for writing memos

Summary:
Adds a new UI for writing access rule memos.

Migrates old memos (written as Python comments) to the new UI.

Test Plan: Browser and migration tests.

Reviewers: jarek, dsagal

Reviewed By: jarek

Subscribers: dsagal, paulfitz

Differential Revision: https://phab.getgrist.com/D3726

app/common/ACLRuleCollection.ts

@@ -454,7 +454,7 @@ function readAclRules(docData: DocData, {log, compile, includeHelperCols}: ReadA
           origRecord: rule,
           aclFormula: String(rule.aclFormula),
           matchFunc: rule.aclFormula ? compile?.(aclFormulaParsed) : defaultMatchFunc,
-          memo: aclFormulaParsed && aclFormulaParsed[0] === 'Comment' && aclFormulaParsed[2],
+          memo: rule.memo,
           permissions: parsePermissions(String(rule.permissionsText)),
           permissionsText: String(rule.permissionsText),
         });