Changes

Prepare release org.glassfish:jakarta.enterprise.concurrent:3.0.0

Prepare next development cycle for 3.0.1-SNAPSHOT

exclude invocation exception from exception causes

If an exception is thrown during contextual call, 
InvocationTargetException was thrown. Now, the original exception
is thrown instead.

Remove empty directories

Post-restructuring adjustments

Use Thread instead of AbstractManagedThread
Virtual threads are final and can't extend from Thread. 
We have to refer to Thread or wrap it into another class.
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

VirtualThreads executor
Passing some tests in VirtualThreadsManagedExecutorServiceTest
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

implement hungTasks for virtual threads

initialize specific (platform or virtual) manageThreadFactory in MES

introduce common ancestor for managed executor services

So far, only hung tasks are here, the goal is to move more
common functionality of the managed executor services.

remove queue tests from virtual threads testing

Virtual thread executor service doesn't use queue, e.g. it doesn't
make sense to test it.

Fix failing VT test: testTaskCounters
getTaskCount should return number of all submitted tasks, including completed ones.
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Add null pointer check. Remove unnecessary println calls
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Refactor managedThreadFactory in executor services
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Fix threadLifeTime test for Virtual threads
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Max parallel tasks test passed for VT
Also added config for logging in tests
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Pass the shutdown test for VT
Speed up tests by programmatic progress instead of sleeps
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

WIP - refactoring
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Passes maxQueueSize test for VT
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Refactored to multirelease JAR that supports Java 11.
Virtual Threads are supported only if run with Java 21.
MultiManagedTaskListener moved to internal package.
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Profile for Java 21 to allow compiling also with Java 11
In that case, virtual threads are not supported in the final JAR
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Update copyright headers
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Align years in copyright headers
Signed-off-by:Ondro Mihalyi <mihalyi@omnifish.ee>

Set version to 3.1.0-SNAPSHOT

Update versions in pom to Jakarta EE 11 M1
Update other versions in pom
Some cleaning
Add dash and consumer pom plug-ins

Signed-off-by: Arjan Tijms <arjan.tijms@omnifish.ee>