Added failable funtions/constructors/getters/setters

[bsneed]

• Added ability for constructors, methods, getters, setters and functions to throw internally similar to JS implementations.
• Added ability for JSError's to be created on the native side and interop with JS.
• Fixed potential retain issue with native class instances.
• Added mocks and tests.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 10 lines in your changes missing coverage. Please review.

Project coverage is 79.86%. Comparing base (a17b5ea) to head (42af47a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/Substrata/Internals/Conversion.swift	91.04%	6 Missing ⚠️
Sources/Substrata/Internals/Callbacks.swift	85.71%	2 Missing ⚠️
Sources/Substrata/Internals/Context.swift	85.71%	1 Missing ⚠️
Sources/Substrata/Types.swift	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   79.63%   79.86%   +0.22%     
==========================================
  Files          12       12              
  Lines        1537     1604      +67     
==========================================
+ Hits         1224     1281      +57     
- Misses        313      323      +10     

Files with missing lines	Coverage Δ
Sources/Substrata/Internals/InternalTypes.swift	86.66% <ø> (ø)
Sources/Substrata/Internals/Context.swift	99.33% <85.71%> (-0.67%)	⬇️
Sources/Substrata/Types.swift	93.10% <50.00%> (-1.15%)	⬇️
Sources/Substrata/Internals/Callbacks.swift	98.37% <85.71%> (-1.63%)	⬇️
Sources/Substrata/Internals/Conversion.swift	72.56% <91.04%> (+1.68%)	⬆️

... and 1 file with indirect coverage changes

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