RFR: 8352645: Add tool support to check order of includes [v3]

[Doug Simon]

On Thu, 27 Mar 2025 10:10:07 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> A couple of nits:
> 
> 1. jcheck fails because of whitespaces
> 2. The /// style comments is a style I haven't encountered before.

I fixed the whitespaces.
I can convert the `///` comments if you want - no strong opinion.

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PR Comment: https://git.openjdk.org/jdk/pull/24247#issuecomment-2757548404