Rename params in NodeFactories for clarity (#1916)

- `context` is now `buildContext` to reflect that it's of type `BuildContext` (and not an android `Context`).
- `NODE` generic type param is now `N` to stick with Java convention: https://docs.oracle.com/javase/tutorial/java/generics/types.html.

app/src/main/kotlin/io/element/android/x/MainNode.kt

@@ -52,7 +52,7 @@ class MainNode(
     override val daggerComponent = (context as DaggerComponentOwner).daggerComponent
 
     override fun resolve(navTarget: RootNavTarget, buildContext: BuildContext): Node {
-        return createNode<RootFlowNode>(context = buildContext)
+        return createNode<RootFlowNode>(buildContext = buildContext)
     }
 
     @Composable