Immer persist

[alex-sparus]

Structural sharing is traditionally preserved in memory only. When serializing multiple values to disk, these are linearized—for example, by writing out sequences as JSON arrays—losing whatever sharing may exist between these values. A similar thing happens when transforming data structures (as with std::transform or a functional map())

Here we introduce an experimental module immer::persist that enables the serialization of pools of containers while preserving structural sharing. With it, we can also do in-memory transformation over large sets of data that considers and preserves structural sharing. This is novel technique, not present in any other implementation of persistent data structures. It has a few use-cases inside BRONZE.

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Codecov Report

Attention: Patch coverage is 96.89922% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.54%. Comparing base (bd9f318) to head (646315e). Report is 114 commits behind head on master.

Files with missing lines	Patch %	Lines
test/oss-fuzz/flex-vector-st-0.cpp	96.15%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #278 +/- ## ========================================== + Coverage 90.53% 90.54% +0.01% ========================================== Files 120 121 +1 Lines 12151 12220 +69 ========================================== + Hits 11001 11065 +64 - Misses 1150 1155 +5 ```

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[arximboldi]

Alright! Thank you for all this work!