Allow native composite types to be passed as script arguments

[SupunS]

Work towards #717

Description

• Introduces an IsImportable method to check the importability as script arguments.
• Add a pre-determined importable flag for native composite types
  • Some native composite types need to be constructed in a special manner, because their methods are coming from the host-enviornment.
  • It requires some additional work to allow them to be constructed via script arguments (not included in this PR)

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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 #973 (ccc652a) into master (7797f9f) will increase coverage by 0.06%.
The diff coverage is 76.92%.

❗ Current head ccc652a differs from pull request most recent head ae24da0. Consider uploading reports for the commit ae24da0 to get more accurate results

@@            Coverage Diff             @@
##           master     #973      +/-   ##
==========================================
+ Coverage   75.46%   75.53%   +0.06%     
==========================================
  Files         268      268              
  Lines       32870    32918      +48     
==========================================
+ Hits        24805    24864      +59     
+ Misses       6929     6917      -12     
- Partials     1136     1137       +1     

Flag	Coverage Δ
unittests	75.53% <76.92%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
runtime/errors.go	52.25% <0.00%> (-5.70%)	⬇️
runtime/interpreter/value.go	77.43% <0.00%> (-0.01%)	⬇️
runtime/sema/block.go	100.00% <ø> (ø)
runtime/sema/deployed_contract.go	73.33% <ø> (ø)
runtime/sema/meta_type.go	100.00% <ø> (ø)
runtime/sema/path_type.go	100.00% <ø> (ø)
runtime/sema/storable_type.go	100.00% <ø> (ø)
runtime/sema/string_type.go	100.00% <ø> (ø)
runtime/sema/type.go	88.03% <81.57%> (-0.11%)	⬇️
runtime/runtime.go	87.22% <100.00%> (ø)
... and 9 more

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[turbolent]

Nice work!