Added cast to/from Null from/to every type

[jorgecarleitao]

We limited what types we accepted on the cast, but do support any type :)

[codecov]

Codecov Report

Merging #1066 (f47916b) into main (b0c601e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1066      +/-   ##
==========================================
+ Coverage   81.32%   81.33%   +0.01%     
==========================================
  Files         363      363              
  Lines       34685    34689       +4     
==========================================
+ Hits        28206    28214       +8     
+ Misses       6479     6475       -4     

Impacted Files	Coverage Δ
src/compute/cast/mod.rs	94.65% <100.00%> (ø)
src/io/parquet/read/deserialize/null.rs	0.00% <0.00%> (ø)
src/io/parquet/write/schema.rs	69.09% <0.00%> (+2.90%)	⬆️

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[ritchie46]

That's useful!