Switch DDScopeEvent ids to long and remove hex String caching

[bantonsson]

Switch the DDScopeEvent ids to long and remove hex String caching in DDId.

Based on top of #1538

[randomanderson]

I think someone from the profiling team needs to approve this. If this affects backend processing. It's my understanding that ScopeEvent is written to the JFR recording.

I also changed the base branch to the PR to make the specific changes here clearer.

[hdafgard]

This looks good to me, and is verified as working with the profiling back-end.

[bantonsson]

@randomanderson Sorry for not adding more context in the PR description. I should have mentioned that this had been discussed with the profiling team, and needs to wait until a backend that handles it is deployed. BTW, I actually prefer having master as the base branch, since it's there I will merge it, and only look at the relevant commit(s) in the files changed view instead.

@hdafgard Are you saying that it works with the currently deployed profiling backend, or the soon to be deployed profiling backend?

[hdafgard]

@hdafgard Are you saying that it works with the currently deployed profiling backend, or the soon to be deployed profiling backend?

Sorry, I meant to say that it works with the fix that is yet to be deployed.