refactor(editor): ♻️ Undo / Redo buttons + structure refacto

Yet another huge refacto... While implementing undo and redo features I understood that I updated the stored typebot too many times (i.e. on each key input) so I had to rethink it entirely. I also moved around some files.

packages/bot-engine/src/services/integration.ts

@@ -50,8 +50,8 @@ const executeGoogleSheetIntegration = async (
   variables: Table<Variable>,
   updateVariableValue: (variableId: string, value: string) => void
 ) => {
-  if (!step.options) return step.edgeId
-  switch (step.options?.action) {
+  if (!('action' in step.options)) return step.edgeId
+  switch (step.options.action) {
     case GoogleSheetsAction.INSERT_ROW:
       await insertRowInGoogleSheets(step.options, variables)
       break

packages/bot-engine/src/services/logic.ts

@@ -9,7 +9,7 @@ import {
   SetVariableStep,
   RedirectStep,
 } from 'models'
-import { isDefined } from 'utils'
+import { isDefined, isNotDefined } from 'utils'
 import { sanitizeUrl } from './utils'
 import { isMathFormula, evaluateExpression, parseVariables } from './variable'
 
@@ -66,7 +66,7 @@ const executeComparison =
     if (!comparison?.variableId) return false
     const inputValue = variables.byId[comparison.variableId].value ?? ''
     const { value } = comparison
-    if (!isDefined(value)) return false
+    if (isNotDefined(value)) return false
     switch (comparison.comparisonOperator) {
       case ComparisonOperators.CONTAINS: {
         return inputValue.includes(value)