Switch from serde_test to serde_assert.

[Anders429]

This closes #162.

I'm really happy with the improvements with this one. The biggest improvement was the significantly reduced complexity of the Allocator and Archetypes tests, both of which are testing DeserializeSeed implementations. Before, a complicated Deserialize-able newtype wrapper was required, but now we can just use the type directly. For the Allocator case, this eliminated hundreds of lines of code.

Additionally, the code now tests the full round-trip serialize and deserialize into sequences, which was not possible with serde_test.

And finally, #160 should be unblocked, due to serde_assert's Unordered, which will allow the tests to still be possible when token order is no longer guaranteed.

[codecov-commenter]

Codecov Report

Merging #163 (3fb0832) into dev (e50aaed) will decrease coverage by 0.36%.
The diff coverage is 98.71%.

@@            Coverage Diff             @@
##              dev     #163      +/-   ##
==========================================
- Coverage   95.05%   94.69%   -0.37%     
==========================================
  Files          75       75              
  Lines       10708    10795      +87     
==========================================
+ Hits        10179    10222      +43     
- Misses        529      573      +44     

Impacted Files	Coverage Δ
src/archetype/identifier/impl_serde.rs	98.44% <91.30%> (-1.56%)	⬇️
src/archetypes/impl_serde.rs	99.37% <95.91%> (+1.23%)	⬆️
src/entity/allocator/impl_serde.rs	98.59% <98.59%> (-0.17%)	⬇️
src/archetype/impl_serde.rs	98.15% <99.18%> (-1.67%)	⬇️
src/entity/identifier/impl_serde.rs	99.26% <100.00%> (+0.12%)	⬆️
src/hlist.rs	98.18% <100.00%> (+0.35%)	⬆️
src/world/impl_serde.rs	100.00% <100.00%> (ø)
src/registry/serde/de/sealed.rs	84.23% <0.00%> (-13.59%)	⬇️
... and 5 more

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