github: Added issue forms

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: Bug Report
+description: Something doesn't work correctly in ImHex.
+title: "[Bug] "
+body:
+- type: dropdown
+  id: os
+  attributes:
+    label: Operating System
+    description: What Operating System are you using ImHex on?
+    options:
+      - Windows
+      - Linux
+      - MacOS
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: What's the issue you encountered?
+    description: |
+      Describe the issue in detail and what you were doing beforehand.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: How can the issue be reproduced?
+    description: Include a detailed step by step process for recreating your issue.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: ImHex Version
+    description: |
+      The version of ImHex you've been using when encountering the bug. If using a nightly, please add the commit hash as well
+    placeholder: X.X.X
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Additional context?
+    value: |
+      - Additional information about your environment.
+      - If possible and useful, please upload the binary you've been editing when the bug occured.
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/feature_request.yaml

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+name: Feature Request
+description: Something you'd like to see added to ImHex in the future
+title: "[Feature] "
+body:
+- type: textarea
+  attributes:
+    label: What feature would you like to see?
+    description: |
+      Describe in detail what the feature should do and how it should work.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: How will this feature be useful to you and others?
+    description: Describe how everybody will benefit from this feature if it gets added.
+  validations:
+    required: true
+- type: checkboxes
+  attributes:
+    options:
+      - label: I can provide PoC for that feature or am willing to work on it myself and submit a PR