Extend ordering comparison (<, <=, >, >=) to String

[darkdrag00nv2]

Closes #2276

Description

Adds comparison support for String

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov]

Codecov Report

Merging #2470 (cc9ace8) into master (18682d6) will decrease coverage by 0.03%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2470      +/-   ##
==========================================
- Coverage   78.25%   78.23%   -0.03%     
==========================================
  Files         325      325              
  Lines       72538    72574      +36     
==========================================
+ Hits        56766    56778      +12     
- Misses      13682    13702      +20     
- Partials     2090     2094       +4     

Flag	Coverage Δ
unittests	78.23% <33.33%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/sema/string_type.go	95.87% <ø> (ø)
runtime/interpreter/value.go	69.45% <33.33%> (-0.11%)	⬇️

[turbolent]

Nice, thank you!