[Java] Add more maven style check for Java code

[asfimport]

Add more maven style check for java code, such as unused imports, redundant modifier, etc. In this way, the quality of code will be improved.

Reporter: Ji Liu / @tianchen92
Assignee: Ji Liu / @tianchen92

Subtasks:

• [Java] Refactor redundant method modifier

PRs and other links:

• GitHub Pull Request #4567

_{Note: This issue was originally created as ARROW-5587. Please see the migration documentation for further details.}