chore: add new data source request template (#86912)

* chore: add new data source request template

* Update 6-data_source_request.yaml

Add placeholder text for Use case field

* Update .github/ISSUE_TEMPLATE/6-data_source_request.yaml

Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>

---------

Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>

.github/ISSUE_TEMPLATE/6-data_source_request.yaml

@@ -0,0 +1,41 @@
+---
+name: New data source request
+description: Raise a request for a new data source plugin
+title: "[New Data Source]: <name-of-service>"
+labels:
+  - area/datasource,type/new-plugin-request
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for requesting a new data source plugin!
+
+        We greatly appreciate feedback from our community about which new data sources would be beneficial. 
+        
+        Grafana Labs regularly reviews these requests and uses them to inform our prioritization. Note: we cannot offer any guarantees on whether we or our community will build a given data source.
+        
+        Please check our [roadmap](https://github.com/orgs/grafana/projects/619?pane=info) for existing requests and subscribe to stay informed of our plans. If no request exists, please fill out the following information.
+  - type: textarea
+    id: background
+    attributes:
+      label: Background
+      description: Tell us about the service you would like to see integrated as a data source
+      placeholder: ACME_DB is an open source time-series database that is used by many organizations to store their metrics data. It is a popular choice for monitoring and observability.
+    validations:
+      required: true
+  - type: textarea
+    id: use_case
+    attributes:
+      label: Use case
+      description: Describe any key requirements or data you would need surfaced, ideally including why they are useful for you.
+      placeholder: My team uses ACME_DB as the application database to monitor our produciton workloads, so we'd like to alert on it and visualize ACME_DB data next to our logs and traces in Grafana.
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Contribution
+      description: If you are interested in creating the data source yourself and contributing to the [plugin catalog](https://grafana.com/grafana/plugins/), please fill in the following
+      options:
+        - label: Are you looking to create the plugin?
+        - label: Are you affiliated with the project/product the data source integrates with?
+        - label: Does the plugin integrate with a commercial product?