feat: added support for Encodable/Decodable partial conformance

[soumyamahunt]

resolves #134

[codecov]

Codecov Report

Attention: Patch coverage is 63.07692% with 72 lines in your changes missing coverage. Please review.

Project coverage is 92.85%. Comparing base (2da1ee9) to head (ed6ca22).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/MacroPlugin/Definitions.swift	0.00%	24 Missing ⚠️
...ibutes/Codable/Decodable/Decodable+Expansion.swift	50.00%	22 Missing ⚠️
...ibutes/Codable/Encodable/Encodable+Expansion.swift	50.00%	22 Missing ⚠️
Sources/MacroPlugin/Plugin.swift	0.00%	2 Missing ⚠️
...odable/Decodable/AttributeExpander+Decodable.swift	95.00%	1 Missing ⚠️
...odable/Encodable/AttributeExpander+Encodable.swift	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   93.95%   92.85%   -1.10%     
==========================================
  Files         114      120       +6     
  Lines        4480     4674     +194     
==========================================
+ Hits         4209     4340     +131     
- Misses        271      334      +63     

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