RFR: 6905: Add rule for heap dumps

[Jean-Philippe Bempel]

On Thu, 1 Oct 2020 21:37:39 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Rule based on ne JDK15 jdk.HeapDump event.
>> If at least on heap dump is performed, rule indicates it as information, score 50.
>> For test added a new JFR file containing an example where 2 dumps were performed
>
> Hi @jpbempel - run mvn spotless:apply, and the remaining problem should go away. :)

hi @thegreystone , in fact running `spotless:apply` did not fix anything.
strangely enough, it passes on windows. and I committed from Window BTW.

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PR: https://git.openjdk.java.net/jmc/pull/113