RFR: 6905: Add rule for heap dumps [v5]

[Marcus Hirt]

On Sat, 3 Oct 2020 13:49:44 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel 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
>
> Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix license

Marked as reviewed by hirt (Lead).

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