Update issue template

Github has started using a new issue templating structure.
This commit moves the current template and adds one additional one.

- Moves issue template to new issue-template folder
- Adds feature request template
- removes the following warning when viewing issue template

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
Closes #10759

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,3 +1,12 @@
+---
+name: Bug report
+about: Create a report to help us improve OpenZFS
+title: ''
+labels: ''
+assignees: ''
+
+---
+
 <!-- Please fill out the following template, which will help other contributors address your issue. -->
 
 <!--
@@ -41,3 +50,4 @@ Example:
 this is an example how log text should be marked (wrap it with ```)
 ```
 -->
+

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,33 @@
+---
+name: Feature request
+about: Suggest a feature for OpenZFS
+title: ''
+labels: 'Type: Feature'
+assignees: ''
+
+---
+
+<!--
+Thank you for suggesting a feature.
+
+Please check the our issue tracker before opening a new feature request.
+Filling out the following template will help other contributors better understand your proposed feature.
+-->
+
+### Describe the feature would like to see added to OpenZFS
+
+<!--
+Provide a clear and concise description of the feature.
+-->
+
+### How will this feature improve OpenZFS?
+
+<!--
+What problem does this feature solve?
+-->
+
+### Additional context
+
+<!--
+Any additional information you can add about the proposal?
+-->