#1249)

Explorer

* Add Schemas and validation class; begin tests

* Finish event schema spec

* Update state with validationMessages with messages from json validator

* ValidationMessages added to event builder frontend

* Add custom checks on payload attributes

* Remove duplicate error messages

* Only validate firebase payloads; aadd tests to schema validations

* cleanup

* Require login for event builder page

* Fix formatting warning

* Ensure userProperties exists before adding error

* Add specs, fix issues, begin formatting errors

* Add documentation to each error

* Add focus button to most errors

* Fix small bugs, fix failing specs

* Add additional check for params and items of events

* Respond to code review

* Fix failing spec; fix focus button on schema returned errors

* Removing params and items list checks -- not sure if they will prevent payload submission

* Don't validate empty items for events that don't require items

* fix warnings 1

* fix warnings 2

* Add payload textbox to Event Builder

* Create payload textbox, begin payload formatting logic

* Added format Payload button; able to format payload

* Add format Payload ability before validate event

* Payload is now being validated, bug still bugs

* Able to validate payload from textbox on first entry

* Add payload formatting errors

* Fix formatting issues

* Remove console logs

* Cleanup

* Fix typescript errors

* Improve design, fix linter errors

* Only validate payload for textbox entries

* Validate api_secret exists

* Fix linter errors

* Update naming

* Change payload URL

* Update styling

* Remove textbox when gtag.js is checkeked

* Validate for firebaseAppId OR measurementID

* Fix schema validation for app_instance_id vs client_id

* Try to remove weirdly formatted error messaging

* Item json schema validations for items array

* Upgrade all dependencies to the latest version and migrate to MUI5.

* address check-types issues

…er (#1861)