Add issue templates (#2124)

* feat: Add issue templates

* feat: Address review comments

* feat: Add GH discussion link

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ["bug", "status:needs-attention"]
+assignees: ''
+
+---
+
+## Bug description
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+<!-- Steps to reproduce the behavior. -->
+1. ...
+2. ...
+
+<!-- Please share the minimal repro of the issue where the bug can be reproduced. -->
+
+<!-- Make sure you are able to reproduce the bug in the `main` branch, too. -->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. Attach screenshots if needed. -->
+
+## Environment
+
+- Target device: [e.g. ESP32-S3] <!-- Use `espflash board-info` to get the target device iformation. -->
+- Crate name and version: [e.g. esp-hal 0.20.0]

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Ask questions in Matrix channel (Recommended)
+    url: https://github.com/esp-rs/esp-hal/discussions/new
+    about: Ask any questions directly in our Matrix channel.
+  - name: Ask questions in GitHub Discussions
+    url: https://github.com/esp-rs/esp-hal/discussions/new
+    about: Post your questions and engage in discussions via GitHub.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ["enhancement", "status:needs-attention"]
+assignees: ''
+
+---
+
+## Motivations
+
+<!-- If your feature request is related to a problem, please describe it. -->
+
+## Solution
+
+<!-- Describe the solution you'd like. -->
+
+## Alternatives
+
+<!-- Describe any alternative solutions or features you've considered. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->