add maintainer label to all new issues

Author: raclim

.github/ISSUE_TEMPLATE/existing-feature-enhancement.yml

@@ -1,6 +1,6 @@
 name: 💡 Existing Feature Enhancement
 description: Suggest an improvement to an existing feature.
-labels: [ Enhancement ]
+labels: [ Enhancement, Awaiting Maintainer Approval ]
 body:
   - type: textarea
     attributes:

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -1,6 +1,6 @@
 name: 🌱 New Feature Request
 description: Request a new feature be added.
-labels: [ Feature Request ]
+labels: [ Feature Request, Awaiting Maintainer Approval ]
 body:
   - type: textarea
     attributes:

.github/ISSUE_TEMPLATE/found-a-bug.yml

@@ -1,6 +1,6 @@
 name: 🐛 Found a Bug
 description: Report p5.js web editor bugs (broken or incorrect behaviour).
-labels: [ Bug ]
+labels: [ Bug, Awaiting Maintainer Approval ]
 body:
   - type: markdown
     attributes: