Update issue templates (ray-project#6407)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug on the latest version of Ray.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!--Please include [tune], [rllib], [autoscaler] etc. in the issue title if relevant-->
+
+### What is the problem?
+
+*Ray version and other system information (Python version, TensorFlow version, OS):*
+
+*Does the problem occur on the [latest wheels](https://ray.readthedocs.io/en/latest/installation.html)?*
+
+
+
+### Reproduction
+Please provide a script that can be run to reproduce the issue. The script should have **no external library dependencies** (i.e., use fake or mock data / environments):
+
+If we cannot run your script, we cannot fix your issue.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Ray, Tune, RLlib, etc.
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+<!--Please include [tune], [rllib], [autoscaler] etc. in the issue title if relevant-->
+
+### Describe your feature request

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: 'Ask a question about Ray usage. '
+title: ''
+labels: question
+assignees: ''
+
+---
+
+<!--Please include [tune], [rllib], [autoscaler] etc. in the issue title if relevant-->
+
+### What is your question?
+
+*Ray version and other system information (Python version, TensorFlow version, OS):*