Symbol table tests + value comparison tests

[mtygesen]

• Added test coverage script
• Added symbol table tests
• Added value comparison tests

[github-actions]

Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-format reports: 20 file(s) not formatted

• Main.cpp
• include/src/Evaluator.hpp
• include/src/ReturnValue.hpp
• include/src/Value.hpp
• include/src/ast/AstBuilder.hpp
• include/src/ast/AstVisitor.hpp
• include/src/error-handling/DplErrorStrategy.hpp
• include/src/error-handling/LexerErrorListener.hpp
• include/src/error-handling/ParserErrorListener.hpp
• include/src/error-handling/exceptions/ArgumentException.hpp
• include/src/error-handling/exceptions/AstException.hpp
• include/src/error-handling/exceptions/DplException.hpp
• include/src/error-handling/exceptions/InternalException.hpp
• include/src/error-handling/exceptions/LexerException.hpp
• include/src/error-handling/exceptions/RuntimeException.hpp
• include/src/symbol-table/VariableTable.hpp
• src/Evaluator.cpp
• src/Value.cpp
• src/VariableTable.cpp
• src/ast/AstBuilder.cpp

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