New non-standard language runtimes

[mcopik]

In SeBS, we initially focused on Python and Node.js, and have work-in-progress support for C++ and Java. However, in addition to standard language runtime available in the clouds, there is an opportunity to use unofficial runtimes that can provide better performance: PyPy for Python, LLRT and Bun for JavaScript, GraalVM for Java. For that, we need to build custom Docker images or try to ship the language runtime with code package (Azure, GCP).