Load Caches from Disk

[iamrecursion]

Pull Request Description

The previous PR (#1991) enabled the writing of IR caches to disk. This PR implements the reading and usage of these caches to drastically speed up the interpreter boot. It cuts what is usually a ~30s boot on my machine to 3-4 seconds depending on load. Note that this speedup does not touch the boot of the Language Server which now dominates IDE project start.

Closes #1873.

Important Notes

Currently the runtime has no means to pre-generate the IR caches. This means that they will be generated on first run and then re-used for subsequent runs.

Note that the deserialization process is currently the bottleneck due to technical considerations. The documentation contains some future work that can speed this up more.

Checklist

Please include the following checklist in your PR:

• The documentation has been updated if necessary.
• All code conforms to the Scala, Java, and Rust style guides.
• All documentation and configuration conforms to the markdown and YAML style guides.
• All code has been tested where possible.

[kustosz]

Looks like code.