Provide an easier way to import component specific scripts

Currently, to load a component specific script (.razor.js) you do something like this:

```csharp
module = await JS.InvokeAsync("import", "./{PATH}/JsCollocation2.razor.js");
```

The `"import"` convention is a bit awkward to remember and you also need specify the script path. Could we make this simpler? Maybe provide an ImportAsync overload? Or maybe a declarative model, like this (suggestion from @DamianEdwards)?:

```csharp
[JsModuleImport]
private IJSObjectReference? Module { get; set; }
```

@MackinnonBuck did some prototyping for component specific styles that work across render modes a while back that might also be worth considering: [MackinnonBuck/blazor-js-components](https://github.com/MackinnonBuck/blazor-js-components)