### What changes were proposed in this pull request?
`CONTRIBUTING.md` introduces how to use Error Prone in IntelliJ IDEA.
### Why are the changes needed?
Error Prone is a static analysis tool for Java that catches common programming mistakes at compile-time. Starting from version 0.4.0, the Celeborn project supports augment the compiler’s type analysis using Error Prone. It's better to provide a detailed guide on how to eliminate classes of serious bugs from entering code in the Celeborn project using Error Prone plugin in IntelliJ IDEA.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
No.
Closes#2047 from SteNicholas/CELEBORN-1091.
Authored-by: SteNicholas <programgeek@163.com>
Signed-off-by: mingji <fengmingxiao.fmx@alibaba-inc.com>
### What changes were proposed in this pull request?
Run `dev/reformat` before you create a new pull request for code style in `CONTRIBUTING.md`.
### Why are the changes needed?
Affects the contribution of creating pull request.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
No.
Closes#1859 from SteNicholas/CELEBORN-927.
Authored-by: SteNicholas <programgeek@163.com>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
### What changes were proposed in this pull request?
As title.
### Why are the changes needed?
As title.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Passes GA.
Closes#1851 from waitinfuture/927.
Authored-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
### What changes were proposed in this pull request?
It was discussed during the last meeting, but abandoned due to the complication.
### Why are the changes needed?
Make the configuration unified.
### Does this PR introduce _any_ user-facing change?
Yes, but the legacy configurations still take effect.
### How was this patch tested?
New UTs.
Closes#1549 from pan3793/CELEBORN-638.
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
