Support for Durable Entities

[cgillum]

### Tasks
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/163
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/164
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/166
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/167
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/182
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/188
- [ ] https://github.com/microsoft/durabletask-dotnet/issues/221

[AlexEngblom]

Have you planned schedule for this yet? Interested, because without this we cannot upgrade at all. It's a bottleneck for going forward with our NET 7 upgrade altogether, because it doesn't have in-proc support.

[wahyuen]

Appreciate the work the team is investing into this. <3 Just wanted to echo @AlexEngblom as we too are bottlenecked with our overall solution being unable to migrate to NET 7 due to lack of support for Durable Entities.

You may not/can not share the information which I can understand, but if you do have the information at hand, we would love to know if this is something we could potentially expect in the near future or something likely we would wait for NET 8 LTS for? This helps tremendously with internal planning and other streams of work internally for us.

[cgillum]

Adding @AnatoliB, @lilyjma, and @sebastianburckhardt

We've gotten a lot of feedback about this as a blocker for upgrading to the .NET Isolated worker, which we take very seriously. The team is currently working on a plan for when we think we can deliver this. Apologies for the lack of clarity here!

[kirk-marple]

@cgillum I know y'all are working hard on Durable Entities, but is there any way to get some guidance from Microsoft on when this may available? (Even roughly like, don't expect it at .NET 8 release.)

Also, I was reading over the ongoing PRs and with the new abstractions, will this require a rewrite of our Durable Entities, or is the expectation that minimal porting will be required?

[davidmrdavid]

@kirk-marple: I'll defer to @lilyjma on the final word, but my understanding is that we're shooting to have this released more or less in the 2nd week of October, if everything goes according to plan.

Also, I was reading over the ongoing PRs and with the new abstractions, will this require a rewrite of our Durable Entities, or is the expectation that minimal porting will be required?

I'll have to defer to @jviau for that.

[jviau]

@kirk-marple the functionality should be very close, but some code changes will be required. It will be about equivalent to the porting needed for orchestrations.