fix(hooks): add dev warning when useEffectEvent callback is not a function

[li-jia-nan]

Summary

• This PR adds a development-only warning to useEffectEvent to help developers catch incorrect usage.
  Currently, if a non-function value is passed as the callback argument, the runtime behavior is undefined. While Flow/TypeScript enforces the type in typed code, untyped JavaScript users may accidentally pass the wrong value.
• With this change, in DEV mode React will emit a warning if the callback is not a function. This is consistent with other React hooks (e.g. useEffect) that validate arguments in development for a better developer experience, while remaining a no-op in production.

How did you test this change?

• Ran yarn test to ensure the full test suite passes with no regressions.
• Verified locally that the warning message appears in the console in development builds, and that no additional code is included in production builds.
• Ran yarn lint, yarn flow, and yarn prettier to confirm formatting and type checks all pass.