dillon1000/react

Refactor Flight Encoding (#26082)

This is just shifting around some encoding strategies for Flight in
preparation for more types.

```
S1:"react.suspense"
J2:["$", "$1", {children: "@3"}]
J3:"Hello"
```

```
1:"$Sreact.suspense"
2:["$", "$1", {children: "$L3"}]
3:"Hello"
```