If statement feature

[JoudiAlakkad]

• add (if, else, conditions, GOTO and labels statements) for all compiler stages.
• add Label Analysis to search for duplicate or undeclared labels (semantic analysis)
• add new Exceptions.
• update test cases.
• modify Compiler Export.

[github-actions]

Code Coverage

File	Coverage [89.80%]	✅
src/jsMain/kotlin/exceptions/CompilationExceptions.kt	61.36%	❌
src/jsMain/kotlin/lexer/Lexer.kt	96.55%	✅
src/jsMain/kotlin/parser/BlockItems.kt	100.00%	✅
src/jsMain/kotlin/parser/Expressions.kt	80.00%	✅
src/jsMain/kotlin/parser/Parser.kt	96.13%	✅
src/jsMain/kotlin/tacky/TackyGenVisitor.kt	85.40%	✅

Total Project Coverage	88.82%	✅