storetestutil: Added shared series helpers on BucketSeries; added Pro…

…xySeries and MultiTSDB Series benchmarks.

Also:
* Fixed minTime for TSDB and Receiver. Now checks head block min Time as well.

Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>

CHANGELOG.md

@@ -13,12 +13,14 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 
 ### Fixed
 
-* [#2665](https://github.com/thanos-io/thanos/pull/2665) Swift: fix issue with missing Content-Type HTTP headers.
+- [#2665](https://github.com/thanos-io/thanos/pull/2665) Swift: fix issue with missing Content-Type HTTP headers.
 - [#2800](https://github.com/thanos-io/thanos/pull/2800) Query: Fix handling of `--web.external-prefix` and `--web.route-prefix`
 - [#2834](https://github.com/thanos-io/thanos/pull/2834) Query: Fix rendered JSON state value for rules and alerts should be in lowercase
 
 ### Changed
 
+- [#2305](https://github.com/thanos-io/thanos/pull/2305) Receive,Sidecar,Ruler: Propagate correct (stricter) MinTime for no-block TSDBs.
+
 ## [v0.14.0](https://github.com/thanos-io/thanos/releases) - IN PROGRESS
 
 ### Fixed