Add container mutation tests for inserting functions into dictionaries

[turbolent]

Description

Just like for arrays, check the insertion of various kinds of functions into dictionaries.

This was triggered by a report from @sideninja that insertion of functions into dictionaries is not working on Mainnet.

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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-commenter]

Codecov Report

Merging #1215 (6e064c5) into master (2b9ff0d) will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1215      +/-   ##
==========================================
+ Coverage   76.91%   77.12%   +0.21%     
==========================================
  Files         272      272              
  Lines       33887    33910      +23     
==========================================
+ Hits        26065    26154      +89     
+ Misses       6724     6693      -31     
+ Partials     1098     1063      -35     

Flag	Coverage Δ
unittests	77.12% <ø> (+0.21%)	⬆️

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

Impacted Files	Coverage Δ
runtime/interpreter/conversion.go	95.12% <0.00%> (ø)
runtime/interpreter/value.go	82.33% <0.00%> (+1.50%)	⬆️
runtime/interpreter/primitivestatictype.go	74.29% <0.00%> (+1.86%)	⬆️

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[SupunS]

LGTM! Thank you for adding this!