Add TBuilder overloads to WithTags and others

[halter73]

var todoGroup = app.MapGroup("/todos");
todoGroup.WithTags("todos");
todoGroup.WithSummary("An endpoint for managing todos.");

todoGroup.MapGet("/", (TodoDb db) => TypedResults.Ok(await db.Todos.ToArrayAsync()));
todoGroup.MapPost("/todos", (Todo todo, TodoDb db) =>
{
    // ....

Fixes #41428

[captainsafia]

LGTM, so far! I believe we also want to update WithOpenApi here.

[halter73]

I believe we also want to update WithOpenApi here.

I really wanted to update WithOpenApi in this PR, but that's a whole other can of worms. It has similar issues as AddFilter because it tries to fish MethodInfo out of the existing Metadata which may not exist yet if WithOpenApi is called on a group. That will have to be a follow up.