Add deleteIrCache

[AdRiley]

Pull Request Description

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
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[JaroslavTulach]

How do you want to write a test for this functionality? E.g. how do you know you are deleting the right caches?

enso/lib/scala/pkg/src/main/scala/org/enso/pkg/Package.scala

Line 97 in 761cb40

irCacheDirectory.getChild(ensoVersion)

It is not easy (for me) to navigate thru the code that finds the right location for a cache. However it should be somewhere around the above line.

Because the code is so convoluted, shouldn't the cleanup be part of it?

Shouldn't the --ir-caching... options be somehow simplified? Merged into a single option? --ir-cache=clean, --ir-cache=off, etc.?

[JaroslavTulach]

To avoid hardcoding these paths, I suggest to put the cleanup code into engine/runner itself. It knows exactly where the caches are and we avoid duplication of this find caches logic.