Update tables public API (#14343)

* Remove old / duplicate classes

* Standardize names of Models types

Also remove TSC.getTable and TC.create, they are no longer part of the
public API

* Update snippets

* Fix tests

* Do not return the created object from create* APIs

Other upsert / merge / update APIs do not have this feature, so it's
inconsistent to return the created object when the other APIs return
void. And since we no longer need it, request that the create* APIs
return no content to reduce the payload size.

* Update test recordings to account for the create* API changes

* Final API changes