Have the max chunks per query limit shared between ingesters and storage gateways

[treid314]

Is your feature request related to a problem? Please describe.
The config option -querier.max-fetched-chunks-per-query counts and limits the number of chunks returned independently for the ingester and storage gateway for a query. While, -querier.max-fetched-series-per-query and -querier.max-fetched-chunk-bytes-per-query limits the sum of series and chunk bytes returned between the ingester and store gateways for a query.

Describe the solution you'd like
The proposed solution is to migrate the -querier.max-fetched-chunks-per-query limit to the new QueryLimiter to limit the number of chunks returned as a sum of chunks returned from the ingester and storage gateway.

Additional context
-querier.max-fetched-chunks-per-query was previously marked as experimental.

[pracucci]

-querier.max-fetched-chunks-per-query was previously marked as experimental.

I just realised it wasn't marked as experimental:
https://cortexmetrics.io/docs/configuration/v1guarantees/

Since it was done after cutting 1.9, let me do right now so we can gain some time.