HIVE-28696: Enforce uniform codestyle in Markdown files in hive-site

[zabetak]

Enforce style using maven the spotless plugin.
Just testing for the moment. Didn't review all changes.

Enforce style during maven build:

mvn clean install

Formatting can be applied to all files using:

mvn spotless:apply

[Aggarwal-Raghav]

@zabetak, this is amazing. I didn't knew, spotless can work for other language as well. Using this will help greatly. Let me know if I can help with review.

I have 1 request though to review #30 and get this merged first. Otherwise because of merge conflicts i would need to rework (manually) and again run this spotless plugin on top of that as it is helping with the padding of columns in markdown.

[Aggarwal-Raghav]

Small Observation: A horizontal line is appearing at the top of the page as the number of dash - is changed. from 3 to the width of the text. Nothing major though.

[thomasrebele]

As far as I understand Hugo's version of markdown, the original markdown is perfectly fine. It represents some YAML metadata (see goldmark-meta). The official Hugo website uses the same syntax. It would be nice if we could avoid changing these lines.

[thomasrebele]

A related PR has been merged into spotless recently: diffplug/spotless#2713. We would need to configure spotless to use flexmark with the YamlFrontMatter extension.

[zabetak]

I'm sure there is a solution for this. The overall question is if enforcing a certain style is desired or it's just gonna be annoying in the long term :)

[zabetak]

@Aggarwal-Raghav Apart from uniform style do you see other benefits for getting this PR in? Does it solve any of the issues that you identified previously? I am trying to gather pros/cons to see if its worth pursuing this further.

[Aggarwal-Raghav]

@zabetak , no I don't see any other benefits but this much only is worth having IMO. It will help in developer readability and markdown file navigation.