feat: Added flexibility to either read "Up", "UP" or "uP" on the table data parser

[pesap]

Closes #1190

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.64%. Comparing base (3ce7468) to head (e704697).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1191   +/-   ##
=======================================
  Coverage   84.64%   84.64%           
=======================================
  Files         180      180           
  Lines        8256     8256           
=======================================
  Hits         6988     6988           
  Misses       1268     1268           

Flag	Coverage Δ
unittests	84.64% <100.00%> (ø)

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Files with missing lines	Coverage Δ
src/parsers/power_system_table_data.jl	82.36% <100.00%> (ø)