(core) Configure more comprehensive eslint rules for Typescript

Summary:
- Update rules to be more like we've had with tslint
- Switch tsserver plugin to eslint (tsserver makes for a much faster way to lint in editors)
- Apply suggested auto-fixes
- Fix all lint errors and warnings in core/, app/, test/

Test Plan: Some behavior may change subtly (e.g. added missing awaits), relying on existing tests to catch problems.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2785

app/client/models/QuerySet.ts

@@ -314,7 +314,7 @@ function convertQueryToRefs(docModel: DocModel, query: Query): QueryRefs {
   const tableRec: any = docModel.dataTables[query.tableId].tableMetaRow;
 
   const colRefsByColId: {[colId: string]: number} = {};
-  for (const col of (tableRec as any).columns.peek().peek()) {
+  for (const col of tableRec.columns.peek().peek()) {
     colRefsByColId[col.colId.peek()] = col.getRowId();
   }