Introduce GitHub markdown editor, keep EasyMDE as fallback (#23876)

The first step of the plan

* #23290

Thanks to @silverwind for the first try in #15394 . Close #10729 and a
lot of related issues.

The EasyMDE is not removed, now it works as a fallback, users can switch
between these two editors.

Editor list:

* Issue / PR comment
* Issue / PR comment edit
* Issue / PR comment quote reply
* PR diff view, inline comment
* PR diff view, inline comment edit
* PR diff view, inline comment quote reply
* Release editor
* Wiki editor

Some editors have attached dropzone

Screenshots:

<details>


![image](https://user-images.githubusercontent.com/2114189/229363558-7e44dcd4-fb6d-48a0-92f8-bd12f57bb0a0.png)


![image](https://user-images.githubusercontent.com/2114189/229363566-781489c8-5306-4347-9714-d71af5d5b0b1.png)


![image](https://user-images.githubusercontent.com/2114189/229363771-1717bf5c-0f2a-4fc2-ba84-4f5b2a343a11.png)


![image](https://user-images.githubusercontent.com/2114189/229363793-ad362d0f-a045-47bd-8f9d-05a9a842bb39.png)

</details>

---------

Co-authored-by: silverwind <me@silverwind.io>

routers/web/repo/editor.go

@@ -538,7 +538,6 @@ func DeleteFilePost(ctx *context.Context) {
 // UploadFile render upload file page
 func UploadFile(ctx *context.Context) {
 	ctx.Data["PageIsUpload"] = true
-	ctx.Data["RequireTribute"] = true
 	upload.AddUploadContext(ctx, "repo")
 	canCommit := renderCommitRights(ctx)
 	treePath := cleanUploadFileName(ctx.Repo.TreePath)
@@ -573,7 +572,6 @@ func UploadFile(ctx *context.Context) {
 func UploadFilePost(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.UploadRepoFileForm)
 	ctx.Data["PageIsUpload"] = true
-	ctx.Data["RequireTribute"] = true
 	upload.AddUploadContext(ctx, "repo")
 	canCommit := renderCommitRights(ctx)