Implement elseif

[MarkusFreitag]

Implements if / elif / else like so:

if(false)
  puts("if")
elif(5 < 4)
  puts("else if")
else
  puts("else")
end

Blocked by the decision from issue #71

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (0d64fb8) 87.46% compared to head (5c308df) 87.37%.

Files	Patch %	Lines
parser/if.go	68.42%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   87.46%   87.37%   -0.10%     
==========================================
  Files         106      106              
  Lines        3710     3731      +21     
==========================================
+ Hits         3245     3260      +15     
- Misses        398      402       +4     
- Partials       67       69       +2     

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