Update return type of `requireNodeAddon`

[kraenhansen]

This function is currently typed to return void, which is not expected.

react-native-node-api/packages/host/src/react-native/NativeNodeApiHost.ts

Line 5 in b91415b

requireNodeAddon(libraryName: string): void;

Instead it should take a generic type parameter extending (and defaulting to) unknown.

Since we're no longer relying on codegen, we can also loose the extends TurboModule and the type import above:

react-native-node-api/packages/host/src/react-native/NativeNodeApiHost.ts

Line 4 in b91415b

export interface Spec extends TurboModule {