Add support for hex literals

[heshanpadmasiri]

Purpose

Resolves #97

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.40%. Comparing base (0424063) to head (120c47b).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
semantics/type_resolver.go	72.22%	8 Missing and 2 partials ⚠️
ast/node_builder.go	55.55%	2 Missing and 2 partials ⚠️
lib/int/runtime/int.go	88.23%	1 Missing and 1 partial ⚠️
ast/types.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   27.99%   29.40%   +1.40%     
==========================================
  Files         254      255       +1     
  Lines       53865    54307     +442     
==========================================
+ Hits        15082    15970     +888     
+ Misses      37855    37357     -498     
- Partials      928      980      +52     

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