Add terraform state registry (#36710)

Adds terraform/opentofu state registry with locking. Implements: https://github.com/go-gitea/gitea/issues/33644. I also checked [encrypted state](https://opentofu.org/docs/language/state/encryption), it works out of the box.

Docs PR: https://gitea.com/gitea/docs/pulls/357

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Co-authored-by: Andras Elso <elso.andras@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/web.go

@@ -1073,6 +1073,10 @@ func registerWebRoutes(m *web.Router, webAuth *AuthMiddleware) {
 						m.Get("", user.ViewPackageVersion)
 						m.Post("", reqPackageAccess(perm.AccessModeWrite), user.PackageVersionDelete)
 						m.Get("/{version_sub}", user.ViewPackageVersion)
+						m.Group("/terraform", func() {
+							m.Post("/lock", user.ActionPackageTerraformLock)
+							m.Post("/unlock", user.ActionPackageTerraformUnlock)
+						}, reqPackageAccess(perm.AccessModeWrite))
 						m.Get("/files/{fileid}", user.DownloadPackageFile)
 					})
 				})