Added support for Extension types in ffi

[jondo2010]

Some nestings of Extension and Struct types need additional support in the ffi Schema handling.

[codecov]

Codecov Report

Base: 83.06% // Head: 83.11% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (f55295a) compared to base (2fa401b).
Patch coverage: 93.75% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1300      +/-   ##
==========================================
+ Coverage   83.06%   83.11%   +0.05%     
==========================================
  Files         361      369       +8     
  Lines       38370    40175    +1805     
==========================================
+ Hits        31872    33392    +1520     
- Misses       6498     6783     +285     

Impacted Files	Coverage Δ
src/ffi/schema.rs	90.08% <93.75%> (-0.30%)	⬇️
src/array/list/iterator.rs	32.14% <0.00%> (-35.30%)	⬇️
src/array/binary/iterator.rs	75.00% <0.00%> (-25.00%)	⬇️
src/array/equal/struct_.rs	46.34% <0.00%> (-24.40%)	⬇️
src/array/fixed_size_binary/iterator.rs	72.72% <0.00%> (-8.53%)	⬇️
src/array/binary/mutable.rs	78.36% <0.00%> (-5.85%)	⬇️
src/array/fixed_size_binary/mod.rs	83.68% <0.00%> (-3.82%)	⬇️
src/array/mod.rs	64.93% <0.00%> (-3.62%)	⬇️
src/array/struct_/iterator.rs	52.94% <0.00%> (-2.62%)	⬇️
src/io/json/read/infer_schema.rs	93.15% <0.00%> (-2.33%)	⬇️
... and 59 more

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[jondo2010]

Clippy errors should be fixed now