Split lfs size from repository size (#22900)

releated to #21820

- Split `Size` in repository table as two new colunms, one is `GitSize`
for git size, the other is `LFSSize` for lfs data. still store full size
in `Size` colunm.
- Show full size on ui, but show each of them by a `title`;  example:

![image](https://user-images.githubusercontent.com/25342410/218636251-e200f085-d7e7-4a25-9ff1-b586a63e07a9.png)

- Return full size in api response.

---------

Signed-off-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: DmitryFrolovTri <23313323+DmitryFrolovTri@users.noreply.github.com>
Co-authored-by: Giteabot <teabot@gitea.io>

routers/web/explore/repo.go

@@ -73,6 +73,14 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 		orderBy = db.SearchOrderBySizeReverse
 	case "size":
 		orderBy = db.SearchOrderBySize
+	case "reversegitsize":
+		orderBy = db.SearchOrderByGitSizeReverse
+	case "gitsize":
+		orderBy = db.SearchOrderByGitSize
+	case "reverselfssize":
+		orderBy = db.SearchOrderByLFSSizeReverse
+	case "lfssize":
+		orderBy = db.SearchOrderByLFSSize
 	case "moststars":
 		orderBy = db.SearchOrderByStarsReverse
 	case "feweststars":