(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/common/DocActions.ts

@@ -82,7 +82,8 @@ const SCHEMA_ACTIONS = new Set(['AddTable', 'RemoveTable', 'RenameTable', 'AddCo
 /**
  * Determines whether a given action is a schema action or not.
  */
-export function isSchemaAction(action: DocAction): action is AddTable | RemoveTable | RenameTable | AddColumn | RemoveColumn | RenameColumn | ModifyColumn  {
+export function isSchemaAction(action: DocAction):
+    action is AddTable | RemoveTable | RenameTable | AddColumn | RemoveColumn | RenameColumn | ModifyColumn {
   return SCHEMA_ACTIONS.has(action[0]);
 }