druid java code formatting

[himanshug]

currently we have an IntelliJ code formatter, an Eclipse code formatter and extras in checkstyle rules related to code formatting. all three of them are probably out of sync. Many times even after I format the code with IntelliJ, I still get formatting errors from checkstyle.

should we adopt some well known code formatting and tools , e.g. https://github.com/google/google-java-format and enforce them with checkstyle e.g. https://checkstyle.sourceforge.io/google_style.html that would be in sync and all the formatting rules are well written.

Related #1951

[leventov]

I support this. This was also proposed here.

[nishantmonu51]

+1

[himanshug]

keeping this open for some time so that most devs get a chance to notice this.

[yurmix]

This will also solve the redundancy we have between the /codestyle scheme directory and the outdated *_formatting.xml files under /dev.
Dev documentation still points to these files here, even though they haven't been updated in past few years.