perf: use a slab allocator for `ObjectInfo`

[foeb]

This should improve performance of the GC by limiting allocations of ObjectInfo to large chunks.

Originally, I was hoping to use the allocator from the slab crate out of the box, but that would cause all of the values to move when ever it needed to resize. I added the pinned_slab module to get around that limitation.

closes #106

[codecov[bot]]

Codecov Report

Merging #129 into master will increase coverage by 0.02%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   83.59%   83.62%   +0.02%     
==========================================
  Files         158      158              
  Lines       10716    10710       -6     
==========================================
- Hits         8958     8956       -2     
+ Misses       1758     1754       -4     

Impacted Files	Coverage Δ
crates/mun_memory/src/gc/mark_sweep.rs	90.15% <91.30%> (+2.47%)	:arrow_up:

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[foeb]

@baszalmstra This is ready for review again :smile:

I moved the Pool code to another repo: https://github.com/foeb/pinned_slab

[Wodann]

Hi @foeb. I hope all is well.

@baszalmstra left some requested changes. Do you need additional information on those, or have you not had time to look at them yet?

If there is anything we can do to help out, please let us know

[baszalmstra]

Im closing this since its become very stale.