STEP() and LOOKUP()

[kellywsq03]

equation format:

• STEP(start height, start time)
• LOOKUP(variable name, X1, X2, ... Xn, Y1, Y2, ... Yn)

closes: #54

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 25.74%. Comparing base (fb5393f) to head (731adc9).

Files with missing lines	Patch %	Lines
client/src/utils/equationValidationRegex.ts	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   25.74%   25.74%           
=======================================
  Files          78       78           
  Lines        1954     1954           
  Branches      348      349    +1     
=======================================
  Hits          503      503           
  Misses       1242     1242           
  Partials      209      209           

Flag	Coverage Δ
client	14.09% <0.00%> (ø)
server	87.98% <ø> (ø)

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