[FLINK-16172][build] Add baseline set of allowed unused dependencies

[zentol]

Add a baseline of dependencies that we allow to be unused, along with a set of dependencies that we allowed to be used without a declared dependencies.

The purpose here is to ease the analysis of unused dependencies by excluding non-critical dependencies.

You can compare the difference by running mvn dependency:analyze before and after this change.

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Last check on commit 7d71265 (Wed Feb 19 12:47:40 UTC 2020)

Warnings:

• 1 pom.xml files were touched: Check for build and licensing issues.
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• ❓ 1. The [description] looks good.
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[zentol]

@StephanEwen What's your overall take on the PR?

[StephanEwen]

Looks good to me, +1 to go ahead