pkg/query: Sort samples before generating flame charts

[metalmatze]

If the samples aren sorted we don't do anything. If there are multiple records we first sort them and then merge them into a single final sorted record.

The real world usage depends on changes from polarsignals/frostdb#949

[alwaysmeticulous]

✅ Meticulous spotted zero visual differences across 251 screens tested: view results.

Meticulous simulated ~4 hours of user flows against your PR.

_{Expected differences? Click here. Last updated for commit be3fff4. This comment will update as new commits are pushed.}