This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.

This change adds a quick workaround for getting kotlinx-benchmark to
work again with Gradle 7.
See https://github.com/Kotlin/kotlinx-benchmark/issues/39.

This pull request updates the Kotlin project to build with Gradle 7.0. 
This is necessary to support building the project with Java 16.

This change integrates the OpenTelemetry Metrics API in the OpenDC
Compute Service implementation. This replaces the old infrastructure for
gathering metrics.

This change adds an initial set of benchmarks for the resource
consumption framework in order to measure the effect of changes on the
performance of the simulator.

This change updates the Github Actions workflow configuration to
generate test reports for the simulator CI builds.

This change updates the dependencies for the OpenDC simulator.

This change adds support for aggregating code coverage results from the
different modules.

This change adds a generic framework for modeling resource consumptions and
adapts opendc-simulator-compute to model machines and VMs on top of
this framework.

This framework anticipates the addition of additional resource types
such as memory, disk and network to the OpenDC codebase.

This commit implements the energy models that are present in CloudSim:
1. Constant
2. Linear
3. Cubic
4. Square root
5. Interpolation based on data.