feat(xo-web/createSubscription): support lazy subscribers (#5158)
feat(xo-web/createSubscription): support lazy subscribers (#5158)

These subscribers follow the value of the subscription but do not make the
subscription refresh itself.

A lazy subscriber triggers an initial fetch if no value is available.
lmcro/xo-web,vatesfr/xo-web,lmcro/xo-web,vatesfr/xo-web,lmcro/xo-web