Directly declare base values in activation without interpreter

[turbolent]

Description

The declaration of the base values does not depend on an interpreter, so refactor the declaration of the base values to be directly performed on the base activation.

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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
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[SupunS]

Nice!
I was tempted to do the same 😄, but wasn't sure whether the interpreter would be useful later on. So I let it be.
But this makes it simple 👌

[codecov-commenter]

Codecov Report

Merging #1022 (378a3a2) into master (d5356c1) will increase coverage by 0.01%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master    #1022      +/-   ##
==========================================
+ Coverage   75.52%   75.53%   +0.01%     
==========================================
  Files         267      268       +1     
  Lines       32992    32974      -18     
==========================================
- Hits        24918    24908      -10     
+ Misses       6947     6942       -5     
+ Partials     1127     1124       -3     

Flag	Coverage Δ
unittests	75.53% <81.25%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
runtime/interpreter/globalvariables.go	60.00% <60.00%> (ø)
runtime/interpreter/interpreter.go	90.96% <90.90%> (+0.91%)	⬆️
runtime/interpreter/variable_activations.go	75.55% <0.00%> (-11.12%)	⬇️

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