provide an API to forcibly start a session

MR removes the TODO and sessions should start automatically

I don't understand the MR or #40.

The method startSession() in the MR is protected, so not part of the API. It only gets called when you set some data in the private tempstore, which is exactly the problem described by this issue -- that you have to set some data in order to start a session.

The current MR in 📌 Remove calls to Request::hasSession() Active removes PrivateTempStore::startSession() entirely.

I suggest we close this issue here as a won't fix.

As commited already 📌 Remove calls to Request::hasSession() Active