scalafmt: code style for scala #184

This PR introduces a maven plugin to reformat automatically the scala classes available in the project. https://scalameta.org/scalafmt

<plugin>
	<groupId>org.antipathy</groupId>
	<artifactId>mvn-scalafmt_2.11</artifactId>
	<version>1.0.1640073709.733712b</version>
</plugin>

In order to support the automatic formatting across the different modules, the type definitions are stored in the dhp-code-stype submodule:

dhp-build/dhp-code-style/src/main/resources/scalafmt/scalafmt.conf

This PR introduces a maven plugin to reformat automatically the scala classes available in the project. https://scalameta.org/scalafmt ``` <plugin> <groupId>org.antipathy</groupId> <artifactId>mvn-scalafmt_2.11</artifactId> <version>1.0.1640073709.733712b</version> </plugin> ``` In order to support the automatic formatting across the different modules, the type definitions are stored in the `dhp-code-stype` submodule: ``` dhp-build/dhp-code-style/src/main/resources/scalafmt/scalafmt.conf ```

As a reference: in order to make the plugin work while compiling the project from the root, as well as on the individual module level (e.g. while oozie-packaging, deploying, running an oozie workflow) the reference to the scalafmt configuration file needed to be expressed as a remote location. I currently set it statically to

https://code-repo.d4science.org/D-Net/dnet-hadoop/raw/branch/beta/dhp-build/dhp-code-style/src/main/resources/scalafmt/scalafmt.conf

A better and more stable location will be updated later on.

As a reference: in order to make the plugin work while compiling the project from the root, as well as on the individual module level (e.g. while oozie-packaging, deploying, running an oozie workflow) the reference to the scalafmt configuration file needed to be expressed as a remote location. I currently set it statically to https://code-repo.d4science.org/D-Net/dnet-hadoop/raw/branch/beta/dhp-build/dhp-code-style/src/main/resources/scalafmt/scalafmt.conf A better and more stable location will be updated later on.

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scalafmt: code style for scala #184

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