chore: meta to env and some fixes + introduce class defs

.idea/runConfigurations/Styve.xml

src/frontend/Constants.java

src/frontend/ast/ASTPrettyPrinter.java

src/frontend/ast/ClassStmt.java

src/frontend/ast/NodeType.java

src/frontend/lexer/Lexer.java

src/frontend/lexer/TokenType.java

src/frontend/parser/Parser.java

src/runtime/Interpreter.java

src/runtime/environment/Environment.java

src/runtime/eval/Expressions.java

src/runtime/eval/Statements.java

src/runtime/values/RTArrayVal.java

src/runtime/values/RTClassVal.java

src/runtime/values/rtValueType.java