feat: add custom memory allocators #3373
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This allows for custom memory allocators.
A use case is a web server with a per-request memory arena. Using certain types of arena allocators with jq, e.g. a bump allocator, should offer a performance boost under certain conditions.
I would very much appreciate some feedback on the testing strategy to use for such a feature. I had a go at it but it seems very unsatisfactory, IMO.