Pass up API forms instead of large objects to top level screens

[dessalines]

Pre-Flight checklist

• Did you check to see if this issue already exists?
• This is a single feature request. (Do not put multiple feature requests in one issue)
• This is not a question or discussion. (Use https://lemmy.ml/c/jerboa for that)

Describe The Feature Request Below

Looking at PostListings.kt, it looks like we're currently passing up larger objects for actions, instead of forms. IE:

onUpvoteClick: (postView: PostView) -> Unit

We then have to do the logic of building the API form manually in a top-level component like HomePane.kt.

homeViewModel.likePost(
  CreatePostLike(
    post_id = postView.post.id,
    score = newVote(postView.post_actions?.like_score ?: 0, VoteType.Upvote),
   ),
)

A better pattern from lemmy-ui, is simply to pass up the form itself, so that top-level components don't have to do any logic:

onUpvoteClick: (form: CreatePostLike) -> Unit

Then we can simply do viewModel.likePost(form), and there's no chance of any mistakes or manipulations.