feat(sparkR): integration of sparkr

[selmazrg]

This PR allows the ability to use R langage on Spark. SparkR can be launched with the command: sparkr3-shell

Which issue(s) this PR fixes

Fixes #764

Additional comments

To integrate SparkR :

• Installation of R ;
• symbolic link from the sparkr folder to R library ;
• render /usr/bin/sparkr-shell command.

Requires :

New build of spakr3.2 with sparkR profile activated is required.
To build spark3.2 with sparkR, follow guideline in README.md file of R. Make sure that your build environment have R > 3.5.

Agreements

• I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004.
• I hereby agree to grant TOSIT a copyright license to use my contributions.

[GuillaumeHold]

To be able to use spark3r-shell --master yarn, the worker group should be added to [spark3_client] .

[Pierrotws]

OK

[rpignolet]

We should add a flag to enable sparkR. Add in tdp_vars/spark/spark.yml and tdp_vars/spark3/spark3.yml a variable spark_enable_r: false.