github: add refactor issue template [no ci]

.github/ISSUE_TEMPLATE/05-enhancement.yml

@@ -1,4 +1,4 @@
-name: Enhancement template
+name: Enhancement
 description: Used to request enhancements for llama.cpp
 title: "Feature Request: "
 labels: ["enhancement"]

.github/ISSUE_TEMPLATE/06-question.yml

@@ -1,4 +1,4 @@
-name: Question template
+name: Question
 description: Used to ask questions about llama.cpp
 title: "Question: "
 labels: ["question"]

.github/ISSUE_TEMPLATE/07-refactor.yml

@@ -0,0 +1,63 @@
+name: Refactor (Maintainers)
+description: Used to track refactoring opportunities
+title: "Refactor: "
+labels: ["refactor"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Don't forget to [check for existing refactor issue tickets](https://github.com/ggerganov/llama.cpp/issues?q=is%3Aopen+is%3Aissue+label%3Arefactoring) in case it's already covered.
+        Also you may want to check [Pull request refactor label as well](https://github.com/ggerganov/llama.cpp/pulls?q=is%3Aopen+is%3Apr+label%3Arefactoring) for duplicates too.
+
+  - type: textarea
+    id: background-description
+    attributes:
+      label: Background Description
+      description: Please provide a detailed written description of the pain points you are trying to solve.
+      placeholder: Detailed description behind your motivation to request refactor
+    validations:
+      required: true
+
+  - type: dropdown
+    id: grokkability
+    attributes:
+      label: Whats the current grokkability of the code in question
+      multiple: false
+      options:
+        - Easy
+        - Normal
+        - Hard
+        - "=.0"
+
+  - type: dropdown
+    id: subsystems
+    attributes:
+      label: Which subsystems are you trying to refactor?
+      multiple: true
+      options:
+        - Kompute
+        - Apple Metal
+        - SYCL
+        - Nvidia GPU
+        - Vulkan
+        - Documentation
+        - Testing
+        - Build
+        - Examples
+        - Devops
+        - Python
+        - Script
+        - Android
+        - Server
+        - GGML
+        - Nix
+        - Embedding
+
+  - type: textarea
+    id: possible-approaches
+    attributes:
+      label: Possible Refactor Approaches
+      description: If you have some idea of possible approaches to solve this problem. You may want to make it a todo list.
+      placeholder: Your idea of possible refactoring opportunity/approaches
+    validations:
+      required: false