Add bug report and feature request GitHub issue templates (#7105)

* Add bug report GitHub template

* PR comments

* Add feature request template

* Tweak

* Add [REQUEST] title

* Remove request title, add note

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: A template for Druid bug reports
+title: ""
+labels: Bug
+assignees: ''
+
+---
+
+Please provide a detailed title (e.g. "Broker crashes when using TopN query with Bound filter" instead of just "Broker crashes").
+
+# Affected Version
+
+The Druid version where the bug was encountered.
+
+# Description
+
+Please include as much detailed information about the bug as possible.
+- Cluster size
+- Configurations in use
+- Steps to reproduce the bug
+- The error message or stack traces encountered. Providing more context, such as nearby log messages or even entire logs, can be helpful.
+- Any debugging that you have already done

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature/Change Request
+about: A template for Druid feature and change requests
+title: ""
+labels: Wish list
+assignees: ''
+
+---
+
+# Description
+
+Please describe the feature or change with as much detail as possible. 
+
+If you have a detailed implementation in mind and wish to contribute that implementation yourself, please open a Proposal issue instead.
+
+# Motivation
+
+Please provide the following for the desired feature or change:
+- A detailed description of the intended use case, if applicable
+- Rationale for why the desired feature/change would be beneficial