[crac] RFR: Convert CRaC tests from shell scripts to Java [v3]

[Radim Vansa]

On Tue, 7 Mar 2023 14:49:27 GMT, Radim Vansa <duke at openjdk.org> wrote:

>> Right now this is a draft as it builds on top of https://github.com/openjdk/crac/pull/47
>> 
>> Please see `CracTest` javadoc for detailed info.
>
> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove forgotten debugging command

Thanks for spotting those, TBH I haven't read through the ChannelResource after refactoring. Addressed.

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PR: https://git.openjdk.org/crac/pull/50