Upgrade to parcel v2, react 18 for example folder

[haotang-dayone]

Current Behavior

Example dir: Use parcel 1, react 16
src and package.json: use react 18
=> sometimes example can't run or has incompatibility issue

Desired Behavior

Both use react 18
Example dir uses parcel v2

Suggested Solution

Update example to

• use parcel 2
• update @types to use react 18 types
• use react createRoot: tps://reactjs.org/link/switch-to-createroot
• fix any consequential issues happening

[kashaudhan]

refer pr #1183 for resolution.