Allow more configuration options for indentation-style (tabs and spaces)

[lfvjimisola]

The documentation states that one can change indentation style (tabs or spaces) by placing .springjavaformatconfig to the root of your project with the following content:

indentation-style=spaces

However, it would be preferably to have a centralized way of configuring it. Adding a file for just one setting really clutters the repo (and there are others libraries/tools that do the same).

Preferably, for us would be to be able to set it without adding another file, i.e. with/for Maven in POM.xml and as a setting directly in VS Code.

I understand that this might not get picked up by the other Gradle, Eclipse, IntelliJ and VS Code (+ Maven = Big 5).

Perhaps, it increases the risk since it's not a Single-Source of Truth setting anymore.

Essentially, this issue is about avoiding having to add yet another file to the repo (reduce clutter) but it might not be possible.

[philwebb]

I'm afraid I've tried to do this before for line widths and failed to find a way that works with all plugins and all IDEs. See #100 (comment) for background. I don't think we can justify the investment needed for this feature, especially as the Spring team generally prefer tabs.