Added support for decimal 256

[jorgecarleitao]

Unfortunately I could not make it without adding an extra (small and no indirect dependencies) dependency, thus the draft.

It should be possible, as we basically just need implementations for

• neg
• cmp
• eq
• from(i128, i128)
• from str
• to str

[codecov]

Codecov Report

Merging #1194 (b52522b) into main (497d431) will decrease coverage by 0.19%.
The diff coverage is 30.61%.

@@            Coverage Diff             @@
##             main    #1194      +/-   ##
==========================================
- Coverage   83.49%   83.30%   -0.20%     
==========================================
  Files         356      356              
  Lines       37081    37200     +119     
==========================================
+ Hits        30961    30989      +28     
- Misses       6120     6211      +91     

Impacted Files	Coverage Δ
src/array/mod.rs	68.54% <ø> (ø)
src/array/primitive/mod.rs	81.04% <ø> (ø)
src/compute/arithmetics/mod.rs	74.10% <ø> (ø)
src/compute/comparison/mod.rs	54.07% <ø> (ø)
src/compute/comparison/simd/native.rs	88.88% <0.00%> (-5.23%)	⬇️
src/ffi/schema.rs	90.38% <0.00%> (-1.48%)	⬇️
src/io/json_integration/read/array.rs	85.59% <0.00%> (-3.90%)	⬇️
src/io/json_integration/write/schema.rs	0.00% <0.00%> (ø)
src/types/mod.rs	100.00% <ø> (ø)
src/types/simd/mod.rs	86.11% <0.00%> (-2.47%)	⬇️
... and 11 more

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