Service routing by name

[michaelHampel]

Added implementation and tests for Restate.service(Class interface, String name) and Restate.serviceHandle(Class interface, String name) to enable routing to services implementing a common interface.

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

Michael Hampel seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[slinkydeveloper]

Hi, thanks for the contribution, seems like you committed some .out directory?

[michaelHampel]

Sorry if I have done something wrong. What do I have to do?

[slinkydeveloper]

look at the committed files, you have a lot of additions that aren't supposed to be there