[SPARK-3324] make yarn module as a unified maven jar project

[Yi Tian]

Hi everyone!

I found the YARN module has nonstandard path structure like:

${SPARK_HOME}
  |--yarn
     |--alpha (contains yarn api support for 0.23 and 2.0.x)
     |--stable (contains yarn api support for 2.2 and later)
     |     |--pom.xml (spark-yarn)
     |--common (Common codes not depending on specific version of Hadoop)
     |--pom.xml (yarn-parent)

When we use maven to compile yarn module, maven will import 'alpha' or 'stable' 
module according to profile setting.
And the submodule like 'stable' use the build propertie defined in yarn/pom.xml 
to import common codes to sourcePath.
It will cause IntelliJ can't directly recognize sources in common directory as 
sourcePath.

I thought we should change the yarn module to a unified maven jar project, 
and add specify different version of yarn api via maven profile setting.

I created a JIRA ticket: https://issues.apache.org/jira/browse/SPARK-3324

Any advice will be appreciated .