Include hack (just a quick demonstration, not meant for merge)

[mzpqnxow]

Here's a quick pass at supporting !include. It's just a proof of concept that works for very basic !include directives

When !include is encountered, it will do one of the following, based on the extension of the file specified:

1. If .yml/.yaml: load as a YaML file, producing structured data
2. Else, consider to be a string and load as such, removing newlines

This is in references to the discussion in #21

[codecov]

Codecov Report

Merging #23 (b811925) into main (014bce9) will decrease coverage by 26.31%.
The diff coverage is 37.50%.

@@             Coverage Diff              @@
##              main      #23       +/-   ##
============================================
- Coverage   100.00%   73.68%   -26.32%     
============================================
  Files            5        5               
  Lines           62       95       +33     
============================================
+ Hits            62       70        +8     
- Misses           0       25       +25     

Impacted Files	Coverage Δ
logging_/config/yaml_config.py	64.78% <37.50%> (-35.22%)	⬇️

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