Support enumarable of RenderFragment and RenderFragment<T> in components

[montyclt]

Is your feature request related to a problem? Please describe.

Support enumarable of RenderFragment and RenderFragment<T> in components.

Describe the solution you'd like

List.razor:

<ul>
    @foreach (var item in Items)
    {
        <li>@item</li>
    }
</ul>

@code {
    [Parameter(Tag = "Item")]
    public IEnumerable<RenderFragment> Items { get; set; }
}

Page.razor:

<List>
    <Item>Item 1</Item>
    <Item>Item 2</Item>
    <Item>Item 3</Item>
</List>

Additional context

Enumerables members usually are written in plural form, but in the usage, the singular form is more accurate. I propose add a parameter in [Parameter] attribute to specify the tag. This proposal should be available to any parameter like this:

Person.razor

[Parameter(Tag = "Name")]
public string FullName { get; set; }

Page.razor

<Person Name="Ivan" />

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[SteveSandersonMS]

I think this is a subset of the request in #29379 where we've done more design and analysis, so I'll close as a duplicate of that.