dillon1000/react

[rfc][env] Hook, object, and function types for Environment globals

Adds `GlobalRegistry`, which holds the names and types of known global objects, 
i.e. 

```js 

type GlobalRegistry = Map<string, PrimitiveType | ObjectType | FunctionType | 
HookType | PolyType>; 

// ... 

globalRegistry.get("NaN"); // {kind: "Primitive"} 

globalRegistry.get("parseInt"); // {kind: "Function", shapeId: "..."} 

globalRegistry.get("Math"); // {kind: "Object", shapeId: "..."} 

``` 

Since we currently do not track module imports and module-level declarations, 
builtin and custom hooks currently also live in GlobalRegistry. 

```js 

globalRegistry.get("useState"); // {kind: "Hook", definition: {...}} 

globalRegistry.get("useFreeze"); // {kind: Hook, definition: {...}} 

``` 

This PR does not allow Forget users to define their own globals. When we add 
this as a configuration, we should not expose `ShapeRegistry` to the user, as a 
user-provided ShapeRegistry may accidentally be not well formed. (i.e. missing 
(1) required shapes (BuiltInArray for [] and BuiltInObject for {}) or (2) some 
recursive shapeIds) 

```js 

export type UserType = UserObject | UserFunction | "Primitive" | "BuiltinObject" 
| ...; 

export type UserObject = { 

kind: "Object", 

properties: Map<string, UserType> 

} 

export type UserFunction = { 

kind: "Function", 

properties: Map<string, UserType>, 

signature: ... 

} 

export type UserGlobals = Map<string, UserType>; 

class Environment { 

constructor(globals: Map<string, UserType>, ...) { 

// ... 

addUserDefinedGlobals(this.#globals, this.#shapes); 

```