ENH: Add GitHub issue templates for bug reports and feature requests

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something is broken in the build or packaging pipeline
+title: "BUG: "
+labels: bug
+assignees: ""
+---
+
+## Environment
+
+- **OS / Platform**: <!-- e.g. Ubuntu 22.04 x86_64, macOS 14 arm64, Windows Server 2022 -->
+- **Python version**: <!-- e.g. 3.11.9 -->
+- **ITK version / branch**: <!-- e.g. v5.4.0, or commit hash -->
+- **Script / entry point used**: <!-- e.g. scripts/dockcross-manylinux-download-cache-and-build-module-wheels.sh -->
+
+## Steps to Reproduce
+
+
+## Expected Behavior
+
+<!-- What should happen. -->
+
+## Actual Behavior
+
+<!-- What actually happens. Paste relevant log output below. -->
+
+<details>
+<summary>Log output</summary>
+
+```
+```
+
+</details>
+
+## Additional Context
+
+<!-- ITKPythonBuilds tag, Docker image tag, CMake options, etc. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: ITK Discourse (questions & support)
+    url: https://discourse.itk.org
+    about: For build questions or general ITK support, please use the ITK Discourse forum.
+  - name: ITKPythonPackage documentation
+    url: https://itkpythonpackage.readthedocs.io
+    about: Check the docs before filing an issue.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new capability or improvement to the build/packaging pipeline
+title: "ENH: "
+labels: enhancement
+assignees: ""
+---
+
+## Problem / Motivation
+
+<!-- What limitation or pain point does this address? -->
+
+## Proposed Solution
+
+<!-- Describe what you'd like to see added or changed. -->
+
+## Alternatives Considered
+
+<!-- Any other approaches you've thought about? -->
+
+## Additional Context
+
+<!-- Platform relevance, ITK module context, links, etc. -->