Proof of concept support for virtual threads using a mjar

[Quinn-With-Two-Ns]

Proof of concept support for virtual threads inside workflows using a multi release jar. A multi release jar is how most other large java projects chose to add support for virtual threads.

TODO:

• Decided if we should support virtual threads for the polling and executor threads as well
• Finalize and document VirtualThreadDelegate
• Update any internal SDK documentation around assuming executors are always backed by a fixed size thread pool
• Get the unit tests to work, they don't seem to respect the multi-jar at the moment
• Decided on if to use the gradle approach or incorporate gradle toolchains