Added .arced/.boxed to arrays

[jorgecarleitao]

This PR adds two helper functions to all arrays. They follow the same pattern as futures::Stream (https://docs.rs/futures/latest/futures/future/trait.FutureExt.html#method.boxed)

The main idea is that they can be used to simplify how code is written:

• array.boxed() is an alias for Box::new(array) as Box<dyn Array>
• array.arced() is an alias for Arc::new(array) as Arc<dyn Array>

[codecov]

Codecov Report

Merging #1040 (cc33075) into main (4477126) will decrease coverage by 0.05%.
The diff coverage is 58.51%.

@@            Coverage Diff             @@
##             main    #1040      +/-   ##
==========================================
- Coverage   81.42%   81.37%   -0.06%     
==========================================
  Files         360      360              
  Lines       34320    34386      +66     
==========================================
+ Hits        27946    27980      +34     
- Misses       6374     6406      +32     

Impacted Files	Coverage Δ
src/io/ipc/mod.rs	40.00% <ø> (ø)
src/io/ipc/write/file_async.rs	81.75% <ø> (ø)
src/io/ipc/write/stream_async.rs	84.94% <ø> (ø)
src/io/parquet/read/deserialize/null.rs	0.00% <0.00%> (ø)
src/io/parquet/write/sink.rs	75.96% <ø> (ø)
src/array/binary/mod.rs	88.82% <50.00%> (-1.29%)	⬇️
src/array/boolean/mod.rs	87.78% <50.00%> (-1.82%)	⬇️
src/array/dictionary/mod.rs	81.18% <50.00%> (-1.97%)	⬇️
src/array/fixed_size_binary/mod.rs	89.00% <50.00%> (-1.27%)	⬇️
src/array/fixed_size_list/mod.rs	64.28% <50.00%> (-0.58%)	⬇️
... and 15 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4477126...cc33075. Read the comment docs.