RFR: 6812: Rules 2.0 [v8]

[Guru Hb]

On Tue, 8 Dec 2020 19:15:29 GMT, Henrik Dafgård <hdafgard at openjdk.org> wrote:

>> This PR will merge the new, breaking, API changes for Rules 2.0 as well as updates to all JMC IRule implementations, the JMC GUI and exporting functionality.
>
> Henrik Dafgård has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update JfrRuleBaseline.xml

Existing changes looks good, Found two result formatting rules were failing for "Duplicated Flags" and "HeapDump rule" and attaching the fix for it : 
[duplicatedFlag_HeapDumpRulefix.zip](https://github.com/openjdk/jmc/files/5664512/duplicatedFlag_HeapDumpRulefix.zip)

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Changes requested by ghb (Reviewer).

PR: https://git.openjdk.java.net/jmc/pull/163