Refactoring of taxonomy and evaluating nodes

[Invizory]

• [ ] Consider removing useless generic parameters like Object and Property in MemberExpression<Object, Property extends PropertyKey>.
• [x] Consider simplifying *Description.
• [ ] Consider adding more methods to EvaluatedExpressions (like typeof and delete).
• [ ] Consider adding wrap to EvaluatedExpressions.
• [ ] Consider renaming Watchable to Boxed or Wrapped.