Added support for field's metadata via FFI

[jorgecarleitao]

No description provided.

[codecov]

Codecov Report

Merging #362 (641edd4) into main (cef5f08) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
+ Coverage   81.05%   81.13%   +0.07%     
==========================================
  Files         326      326              
  Lines       21103    21147      +44     
==========================================
+ Hits        17105    17157      +52     
+ Misses       3998     3990       -8     

Impacted Files	Coverage Δ
src/ffi/schema.rs	64.61% <100.00%> (+6.69%)	⬆️
tests/it/ffi.rs	100.00% <100.00%> (ø)
src/io/json_integration/schema.rs	44.58% <0.00%> (-0.31%)	⬇️
src/types/mod.rs	29.20% <0.00%> (+0.88%)	⬆️
src/datatypes/field.rs	25.21% <0.00%> (+5.88%)	⬆️

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