Add support for serialization of large caches

[jarbus]

Fixes #45, where serialization of large LRU might result in a stack overflow. Does not automatically load Serialization, but uses extensions to overwrite Serialization.{serialize,deserialize} if Serialization is loaded, available in julia 1.9+.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3125353) 78.45% compared to head (77d67a0) 81.97%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #46 +/- ## ========================================== + Coverage 78.45% 81.97% +3.52% ========================================== Files 2 3 +1 Lines 297 355 +58 ========================================== + Hits 233 291 +58 Misses 64 64 ```

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[jarbus]

Thanks for the review @ericphanson, committed the changes you suggested!

[Jutho]

This looks great, thanks. I've also added some minor comments and questions.

[jarbus]

All great feedback so far, I've learned an unexpected amount about Julia from this simple PR. Thanks!

[Jutho]

Do you want another review? I can ask a person in our group that recently implemented some serialisation things for some other cache structures that we have in our code, but he is only available from Friday onwards. I am also fine with having this merged as is.

[jarbus]

I'm fine with either, doesn't hurt to get another set of eyes on it and I've already pointed all my code to my branch anyways

[lkdvos]

Woops, seems like I was too fast in suggesting the while loop to for loop change, the iterator indeed only returns the values, not the nodes themselves. My apologies!

[jarbus]

Thanks for the in-depth feedback @lkdvos! I'll look into implementing your suggested refactor. Also I suppose I need to undo that last commit now as well haha

[jarbus]

@lkdvos Finished working on your recommended changes, serialization code is much cleaner now. Thanks for your input!

[Jutho]

Looks good to me; maybe @lkdvos can take a final look and then we can merge.

[jarbus]

Good point, honestly not sure how to handle the multiple references to mutable values case, though.

[ericphanson]

The regular serializer handles it, so I was hoping it would just work

[jarbus]

Great feedback @ericphanson, worked as expected. I was able to clean everything up, code is much nicer now.

[jarbus]

@Jutho @ericphanson are there any other changes you recommend before merging?

[ericphanson]

Sorry, forgot about this. I think it’s good to go!