Unleash / unleash / 11888793285

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chore: improve the performance of our instance stats (#8766)

## About the changes
Our stats are used for many places and many times to publish prometheus
metrics and some other things.

Some of these queries are heavy, traversing all tables to calculate
aggregates.

This adds a feature flag to be able to memoize 1 minute (by default) how
long to keep the calculated values in memory.

We can use the key of the function to individually control which ones
are memoized or not and for how long using a numeric variant.

Initially, this will be disabled and we'll test in our instances first

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