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>

options/locale/locale_en-US.json

@@ -3611,6 +3611,18 @@
   "packages.swift.registry": "Set up this registry from the command line:",
   "packages.swift.install": "Add the package in your <code>Package.swift</code> file:",
   "packages.swift.install2": "and run the following command:",
+  "packages.terraform.install": "Set your state to use the HTTP backend",
+  "packages.terraform.install2": "and run the following command:",
+  "packages.terraform.lock_status": "Lock Status",
+  "packages.terraform.locked_by": "Locked by %s",
+  "packages.terraform.unlocked": "Unlocked",
+  "packages.terraform.lock": "Lock",
+  "packages.terraform.unlock": "Unlock",
+  "packages.terraform.lock.success": "Terraform state was successfully locked.",
+  "packages.terraform.unlock.success": "Terraform state was successfully unlocked.",
+  "packages.terraform.lock.error.already_locked": "Terraform state is already locked.",
+  "packages.terraform.delete.locked": "Terraform state is locked and cannot be deleted.",
+  "packages.terraform.delete.latest": "The latest version of a Terraform state cannot be deleted.",
   "packages.vagrant.install": "To add a Vagrant box, run the following command:",
   "packages.settings.link": "Link this package to a repository",
   "packages.settings.link.description": "If you link a package with a repository, the package will appear in the repository's package list. Only repositories under the same owner can be linked. Leaving the field empty will remove the link.",