Fixed error in consuming sliced FixedSizedBinary from c data interface (FFI)

[jorgecarleitao]

The (fixed) size of the array must be taken into account when offsetting the values buffer.

This resulted in reading less elements than required (i.e. it would never cause a read out of bounds).

[codecov]

Codecov Report

Merging #1026 (f350daf) into main (c013e49) will increase coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1026      +/-   ##
==========================================
+ Coverage   71.62%   71.86%   +0.24%     
==========================================
  Files         359      359              
  Lines       19916    19916              
==========================================
+ Hits        14264    14313      +49     
+ Misses       5652     5603      -49     

Impacted Files	Coverage Δ
src/ffi/array.rs	86.62% <ø> (+2.54%)	⬆️
src/array/list/mod.rs	70.79% <0.00%> (+0.88%)	⬆️
src/compute/arithmetics/time.rs	26.60% <0.00%> (+0.91%)	⬆️
src/array/mod.rs	68.08% <0.00%> (+1.06%)	⬆️
src/array/fixed_size_binary/mod.rs	90.29% <0.00%> (+1.94%)	⬆️
src/ffi/schema.rs	75.08% <0.00%> (+6.79%)	⬆️
src/array/ffi.rs	85.00% <0.00%> (+10.00%)	⬆️
src/ffi/bridge.rs	83.33% <0.00%> (+11.11%)	⬆️
src/array/fixed_size_binary/ffi.rs	60.00% <0.00%> (+60.00%)	⬆️

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