Add ability to refresh a record

[AlecAivazis]

Describe the feature

Right now the only way to manage invalid data is to mark it as stale. We should add a way to tell the cache to reload a particular record by notifying every current subscriber of that record to refetch.

Not sure on the exact name of the method yet but it could look something like

function applyMutation() {
    const { data } = await MyMutation.mutate()
    
    const user = cache.get("User", { id: data.updateUser.user.id })

    // options are things like "invalidate", "refresh", etc
    user.refetch()
}

Criticality

cool improvement, my projects will benefit from it

[knd775]

For us, this would be the single largest improvement that could be made. We have so much weird code to work around this right now.