* Add `Column.shardingKeyIdx` for column definition for BanyanDB.
```
Sharding key is used to group time series data per metric of one entity in one place (same sharding or same
column for column-oriented database).
For example,
ServiceA's traffic gauge, service call per minute, includes following timestamp values, then it should be sharded by service ID
[ServiceA(encoded ID): 01-28 18:30 values-1, 01-28 18:31 values-2, 01-28 18:32 values-3, 01-28 18:32 values-4]
BanyanDB is the 1st storage implementation supporting this. It would make continuous time series metrics stored closely and compressed better.
NOTICE, this sharding concept is NOT just for splitting data into different database instances or physical files.
```
* Add `JD_PRESERVE_LINE_FEEDS=true` in official code style file. Then our comments don't have to use many blank lines to keep format.
Motivation:
Review code styles with some bots automatically.
Modifications:
Set up ReviewDog in GitHub Action to review code style.
Add more check rules to checkstyle plugin.
Result:
Obvious code styles can be reviewed and commented automatically.
吴晟 Wu Sheng
Stephen Ni
Daming
kezhenxu94
peng-yongsheng