Decide & apply what time range query without stores should announce

[brancz]

This is a follow up from #1284 (comment)

If a query component has no stores discovered, it currently announces that it has data from time range 0 to math.MaxInt64. @bwplotka mentioned that this should either be all of time, which would be math.MinInt64 to math.MaxInt64 or nothing, which could be represented as math.MaxInt64 to math.MaxInt64.

I think either of those two make more sense than what we currently have, but I'm tending towards the latter, to not do unneeded requests to a store.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue/PR has been automatically marked as stale because it has not had recent activity. Please comment on status otherwise the issue will be closed in a week. Thank you for your contributions.

[brancz]

We have yet to decide on this.

[stale]

This issue/PR has been automatically marked as stale because it has not had recent activity. Please comment on status otherwise the issue will be closed in a week. Thank you for your contributions.

[bwplotka]

I like or nothing, which could be represented as math.MaxInt64 to math.MaxInt64 but maybe in form or [0:0] It is just more readable for humans... WDYT?

[brancz]

Happy with 0, 0. Will do a PR.