misc: [+] literalCol value getter & git hooks

[eruizalo]

Description

• [+] git hooks examples in case they are useful for anyone else
• [+] Doric columns getter in case they are literal columns. With this function we will be able to validate some functions (i.e. with require) before spark.

Related Issue and dependencies

• Resolves N/A
• Depends on N/A

How Has This Been Tested?

• This pull request contains appropriate tests?:
  • YES

[codecov]

Codecov Report

Merging #288 (753610f) into main (5ff2fda) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   97.35%   97.35%   +0.01%     
==========================================
  Files          58       58              
  Lines        1131     1134       +3     
  Branches       13       15       +2     
==========================================
+ Hits         1101     1104       +3     
  Misses         30       30              

Flag	Coverage Δ
spark-2.4.x	94.87% <100.00%> (+0.02%)	⬆️
spark-3.0.x	96.66% <100.00%> (+0.01%)	⬆️
spark-3.1.x	97.46% <100.00%> (+0.01%)	⬆️
spark-3.2.x	97.46% <100.00%> (+0.01%)	⬆️
spark-3.3.x	97.46% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...c/main/scala/doric/syntax/LiteralConversions.scala	100.00% <100.00%> (ø)

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