Google Java Style validation

[SrinivasanTarget]

Change list

Checkstyle validation to ensure google java code style is followed or not

Types of changes

What types of changes are you proposing/introducing to Java client?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Details

Continuation of #346

@TikhomirovSergey @Jonahss @bootstraponline Please take a look at this PR :)

[SrinivasanTarget]

We can perform checks through maven going forward from CI.
https://maven.apache.org/plugins/maven-checkstyle-plugin/plugin-info.html

[SrinivasanTarget]

Great to see our repo audit reports shows there are "0" errors and "7774" warnings that we can work out.

[SrinivasanTarget]

[TikhomirovSergey]

@SrinivasanTarget
I like this PR 👍
But I a little but modified it. My modification is here: https://github.com/TikhomirovSergey/java-client/blob/SrinivasanTarget-master/pom.xml

I'm going to merge this PR with my own modification after source code improvement.

@bootstraponline What do you think about this? I think it is much better solution than proposed here:
#269. The idea: CI build should be failed on code style violation. All this thing are going to be documented in details. Now we have the description how to set up the requrd code style settings: https://github.com/appium/java-client/blob/master/docs/Note-for-developers.md

[SrinivasanTarget]

I like your modification @TikhomirovSergey 👍

[SrinivasanTarget]

@TikhomirovSergey Added goals as per your comments :)

[SrinivasanTarget]

👍

[SrinivasanTarget]

@TikhomirovSergey Have a query. Are we expecting this (https://github.com/TikhomirovSergey/java-client/blob/f64c9a189038af7915e17bbbd829c0f7cab6d262/src/test/java/io/appium/java_client/ios/IOSDriverTest.java#L71) to fail?

[SrinivasanTarget]

Thanks for adding me:)

[bootstraponline]

CI build should be failed on code style violation

👍