One to many relation loading optimization

[farid-fereidooni]

For updating a post comment following code is written:

CwkSocial/CwkSocial/CwkSocial.Application/Posts/CommandHandlers/UpdatePostCommentHandler.cs

Lines 26 to 28 in 6087579

	var post = await _ctx.Posts
	.Include(p => p.Comments)
	.FirstOrDefaultAsync(p => p.PostId == request.PostId, cancellationToken);

For example, if the post has more than 2000 comments, This code will load all of them into memory.
While we need to update only one comment.

Wouldn't it be better to do it as this:

var post = await _ctx.Posts
    .Include(p => p.Comments.Where(_ => _.CommentId == request.CommentId))
    .FirstOrDefaultAsync(p => p.PostId == request.PostId, cancellationToken);

[danpdc]

I think it makes sense. Can you submit a PR and I'll review it more carefully?