* Add batch route
* Register batch route
* Allow batching on writable endpoints
* Batch in client
* Batch non-GET requests
* Batching support with typescript defs
* Remove unused hook
* Prevent multiple fragment updates
* Only use batch route if detected
* Correct var name
* Move nonce check to validate_callback so it runs before requests are completed
* remove unused imports
* updateCartFragments function as const
* Add phpunit tests for batching functionality
* Reduce batch delay
* increase timeout
* `use` is never relative - absolute is always used so backslash is not needed
* Move process_legacy_payment code to rest api class
* Move storeapi directory
* Updated namespaces and moved tests
Mike Jolley
Claudio Sanches
Darren Ethier