Use more idiomatic versions

[jorgecarleitao]

• Buffer::from_trusted_len_iter -> .collect::<Vec<_>>().into()
• Buffer::try_from_trusted_len_iter -> .collect::<Result<Vec<_>>>()?.into()

and un-nested some if-else statements.

[codecov]

Codecov Report

Merging #898 (2bf7015) into main (3f0983b) will increase coverage by 0.00%.
The diff coverage is 88.70%.

@@           Coverage Diff           @@
##             main     #898   +/-   ##
=======================================
  Coverage   70.28%   70.29%           
=======================================
  Files         344      344           
  Lines       18794    18801    +7     
=======================================
+ Hits        13210    13216    +6     
- Misses       5584     5585    +1     

Impacted Files	Coverage Δ
src/buffer/immutable.rs	92.85% <ø> (-3.58%)	⬇️
src/compute/arity.rs	77.77% <76.00%> (+0.44%)	⬆️
src/compute/arithmetics/decimal/add.rs	96.55% <87.50%> (+0.18%)	⬆️
src/compute/arithmetics/decimal/sub.rs	96.49% <87.50%> (+0.19%)	⬆️
src/compute/arithmetics/decimal/div.rs	77.50% <88.23%> (+0.87%)	⬆️
src/compute/arithmetics/decimal/mul.rs	76.54% <88.23%> (+0.90%)	⬆️
src/compute/cast/binary_to.rs	80.55% <100.00%> (+0.55%)	⬆️
src/compute/cast/boolean_to.rs	100.00% <100.00%> (ø)
src/compute/hash.rs	100.00% <100.00%> (ø)
src/compute/length.rs	100.00% <100.00%> (ø)
... and 3 more

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