This change converts the resource classes of the OpenDC web server to
use Java, The Quarkus integration for Java is more mature and the
programming quality of experience is not that much worse.

This change updates the OpenDC web server to use Panache (provided by
Quarkus) to model entities. Such approach is better supported in Quarkus
and simplifies our implementation.

This change updates the Quarkus-based web server with a new endpoint for
querying data about the active user including accounting data.

This change updates the Quarkus-based web server to add support for
tracking and limiting the simulation minutes used by the user in order
to prevent misuse of shared resources.

This change updates the build configuration to use Spotless for code
formating of both Kotlin and Java.

This change updates the repository to remove the use of wildcard imports
everywhere. Wildcard imports are not allowed by default by Ktlint as
well as Google's Java style guide.

This change updates the Quarkus configuration of the OpenDC web server
to serve as a fully standalone distribution that is capable of serving
the web UI, web API, and experiment runner. Such an approach vastly
simplifies local deployments.

For Docker deployments, we create a custom Quarkus profile that uses
PostgreSQL and disables the web UI.