Add loading yaml label template files (#22976)

Extract from #11669 and enhancement to #22585 to support exclusive
scoped labels in label templates

* Move label template functionality to label module
* Fix handling of color codes
* Add Advanced label template

options/label/Advanced.yaml

@@ -0,0 +1,70 @@
+labels:
+  - name: "Kind/Bug"
+    color: ee0701
+    description: Something is not working
+  - name: "Kind/Feature"
+    color: 0288d1
+    description: New functionality
+  - name: "Kind/Enhancement"
+    color: 84b6eb
+    description: Improve existing functionality
+  - name: "Kind/Security"
+    color: 9c27b0
+    description: This is security issue
+  - name: "Kind/Testing"
+    color: 795548
+    description: Issue or pull request related to testing
+  - name: "Kind/Breaking"
+    color: c62828
+    description: Breaking change that won't be backward compatible
+  - name: "Kind/Documentation"
+    color: 37474f
+    description: Documentation changes
+  - name: "Reviewed/Duplicate"
+    exclusive: true
+    color: 616161
+    description: This issue or pull request already exists
+  - name: "Reviewed/Invalid"
+    exclusive: true
+    color: 546e7a
+    description: Invalid issue
+  - name: "Reviewed/Confirmed"
+    exclusive: true
+    color: 795548
+    description: Issue has been confirmed
+  - name: "Reviewed/Won't Fix"
+    exclusive: true
+    color: eeeeee
+    description: This issue won't be fixed
+  - name: "Status/Need More Info"
+    exclusive: true
+    color: 424242
+    description: Feedback is required to reproduce issue or to continue work
+  - name: "Status/Blocked"
+    exclusive: true
+    color: 880e4f
+    description: Something is blocking this issue or pull request
+  - name: "Status/Abandoned"
+    exclusive: true
+    color: "222222"
+    description: Somebody has started to work on this but abandoned work
+  - name: "Priority/Critical"
+    exclusive: true
+    color: b71c1c
+    description: The priority is critical
+    priority: critical
+  - name: "Priority/High"
+    exclusive: true
+    color: d32f2f
+    description: The priority is high
+    priority: high
+  - name: "Priority/Medium"
+    exclusive: true
+    color: e64a19
+    description: The priority is medium
+    priority: medium
+  - name: "Priority/Low"
+    exclusive: true
+    color: 4caf50
+    description: The priority is low
+    priority: low