Added FixedSizeListScalar and FixedSizeBinaryScalar

[illumination-k]

• Adding FixedSizeListScalar and FixedSizeBinaryScalar
• Supporting FixedSizeListScalar and FixedSizeBinaryScalar in new_scalar
• Adding related test

related to #782 and #783

[codecov]

Codecov Report

Merging #786 (45b6e78) into main (684c259) will increase coverage by 0.00%.
The diff coverage is 70.73%.

@@           Coverage Diff           @@
##             main     #786   +/-   ##
=======================================
  Coverage   71.08%   71.08%           
=======================================
  Files         317      319    +2     
  Lines       16623    16664   +41     
=======================================
+ Hits        11816    11846   +30     
- Misses       4807     4818   +11     

Impacted Files	Coverage Δ
src/scalar/mod.rs	65.62% <0.00%> (-29.83%)	⬇️
src/scalar/fixed_size_binary.rs	84.61% <84.61%> (ø)
src/scalar/fixed_size_list.rs	100.00% <100.00%> (ø)
src/io/parquet/read/nested_utils.rs	78.43% <0.00%> (+0.98%)	⬆️

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[jorgecarleitao]

Looks awesome! I left a small number of comments / suggestions. Awesome PR, @illumination-k !

[jorgecarleitao]

What do you think about

Suggested change

	values: Arc<dyn Array>,
	is_valid: bool,
	values: Option<Arc<dyn Array>>,

and remove is_valid?

[illumination-k]

I referred to ListScalar, but I think Option<Arc<dyn Array>> is better and value method should return Option<&Arc<dyn Array>> for consistency of other scalar.

StructScalar and ListScalar also have is_valid. Should we use Option and remove is_valid for them? (Maybe another PR)

[jorgecarleitao]

Thanks a lot, @illumination-k !