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>

templates/repo/sub_menu.tmpl

@@ -14,7 +14,7 @@
 						<a href="{{.RepoLink}}/tags">{{svg "octicon-tag"}} <b>{{.NumTags}}</b> {{.locale.TrN .NumTags "repo.tag" "repo.tags"}}</a>
 					</div>
 				{{end}}
-				<div class="item">
+				<div class="item" {{if not (eq .Repository.Size 0)}}data-tooltip-content="{{.Repository.SizeDetailsString}}"{{end}}>
 					{{$fileSizeFormatted := FileSize .Repository.Size}}{{/* the formatted string is always "{val} {unit}" */}}
 					{{$fileSizeFields := StringUtils.Split $fileSizeFormatted " "}}
 					<span>{{svg "octicon-database"}} <b>{{.locale.PrettyNumber (index $fileSizeFields 0)}}</b> {{index $fileSizeFields 1}}</span>