Add Enhancement request template (#4063)

* Add Enhancement request template

* Link to github discussions

* Update config.yml

.github/ISSUE_TEMPLATE/config.yml

@@ -1 +1,5 @@
 blank_issues_enabled: false
+contact_links:
+  - name: Discussions
+    url: https://github.com/nasa/openmct/discussions
+    about: Got a question?

.github/ISSUE_TEMPLATE/enhancement-request.md

@@ -0,0 +1,20 @@
+---
+name: Enhancement request
+about: Suggest an enhancement or new improvement for this project
+title: ''
+labels: type:enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.