Add MaxByAsync and MinByAsync

[CollinAlpert]

.NET 6 introduces the MaxBy and MinBy APIs. I would like to query the database using these methods, more specifically the async version.

I am proposing to add the following methods to EntityFrameworkQueryableExtensions:

public static Task<TSource> MaxByAsync<TSource, TKey>(this IQueryable<TSource> source, Expression<Func<TSource, TKey>> selector, CancellationToken cancellationToken = default);

public static Task<TSource> MinByAsync<TSource, TKey>(this IQueryable<TSource> source, Expression<Func<TSource, TKey>> selector, CancellationToken cancellationToken = default);

I am happy to provide a PR as soon as I get feedback on this issue.

[ajcvickers]

Duplicate of #25566.

[CollinAlpert]

@ajcvickers I saw that issue but decided my issue was different, as I am proposing to add async versions. My apologies for raising a duplicate.

[ajcvickers]

@CollinAlpert Sync and async should be done at the same time.