Add support for match statements where pattern is const

[heshanpadmasiri]

Purpose

resolves #98
depends on #150, #182

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[codecov]

Codecov Report

❌ Patch coverage is 81.46930% with 169 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.12%. Comparing base (8e7b2a8) to head (f843c7d).

Files with missing lines	Patch %	Lines
semantics/type_narrowing/type_narrowing.go	90.53%	24 Missing and 6 partials ⚠️
bir/bir_gen.go	73.46%	24 Missing and 2 partials ⚠️
ast/match_patterns.go	8.00%	23 Missing ⚠️
semantics/type_resolver.go	88.16%	14 Missing and 6 partials ⚠️
ast/node_builder.go	69.81%	13 Missing and 3 partials ⚠️
test_util/testphases/phases.go	74.41%	5 Missing and 6 partials ⚠️
ast/pretty_printer.go	82.45%	7 Missing and 3 partials ⚠️
ast/expressions.go	20.00%	8 Missing ⚠️
ast/statements.go	0.00%	7 Missing ⚠️
semantics/control_flow_analyzer.go	77.41%	6 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   27.90%   29.12%   +1.21%     
==========================================
  Files         254      257       +3     
  Lines       53858    54627     +769     
==========================================
+ Hits        15031    15909     +878     
+ Misses      37890    37758     -132     
- Partials      937      960      +23     

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