feat: wait group

[alvynben]

This PR introduces comprehensive support for the WaitGroup synchronization primitive in the go-slang interpreter, enhancing the concurrency capabilities of the language. Key components of the update include:

Type System Enhancements:

1. New types (NewType and MakeType) have been added to accommodate the WaitGroup and differentiate between creation methods (new vs. make).
2. Modifications to the type system are reflected across type literals and command structures, expanding the interpreter's understanding of these new constructs.

Interpreter Functionality:

1. The CallExpression handling in the interpreter now recognizes and processes methods called on WaitGroup instances (add, done, and wait), using a new structured approach to manage method-specific actions dynamically.
2. New operations for WaitGroup (WaitGroupAddOp, WaitGroupDoneOp, WaitGroupWaitOp) are implemented to handle the respective functionalities of the WaitGroup methods.

Heap Management:

1. The heap management system has been updated to allocate and manage memory for WaitGroup instances correctly.
2. New tags (PointerTag.WaitGroup) have been added to manage WaitGroup pointers specifically.

Video Description:

Screen.Recording.2024-04-14.at.1.58.34.AM.mov