[breaking][bun:ffi] Change the pointer representation to be a 52-bit integer

Storing the pointer this way enables DOMJIT to be used with a new API in `bun:ffi` that lets you efficiently read values from a pointer without creating a new `DataView`

```js
import {read} from 'bun:ffi';
const myPtr = myFunctionThatReturnsAPtr();

// new:
const value = read.u32(myPtr, 0);

// old:
const view = new DataView(toArrayBuffer(myPtr));
const otherValue = view.getUint32(0, true);
```

cc @bwasti this might be a breaking change for that call to `napi_add_finalizer`

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