Promise 2.0 for Virtual Threads

pom.xml

src/main/java/net/diversionmc/async/Blocking.java

src/main/java/net/diversionmc/async/Promise.java

src/main/java/net/diversionmc/async/PromiseException.java

src/main/java/net/diversionmc/async/barrier/Barrier.java

src/main/java/net/diversionmc/async/channel/Channel.java

src/main/java/net/diversionmc/async/mutex/Mutex.java

src/main/java/net/diversionmc/async/mutex/MutexMap.java

src/main/java/net/diversionmc/async/schedule/Scheduler.java

...a/net/diversionmc/async/schedule/ThreadPoolScheduler.java

...et/diversionmc/async/schedule/VirtualThreadScheduler.java