chore: Create issue templates (#371)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us reproduce and correct the bug
+labels: ['bug', 'needs-triage']
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      #### Before submitting a bug, please make sure the issue hasn't been already
+      addressed by searching through [the past issues](https://github.com/probabl-ai/skore/issues).
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: >
+      A clear and concise description of the bug.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Steps/Code to Reproduce
+    description: |
+      Please add a minimal code example that can reproduce the error when running it. Be as succinct as possible, **do not depend on external data files**.
+    placeholder: |
+      Describe each step to reproduce the problem, along with related sample code if relevant.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: >
+      A clear and concise description of what you expected to happen.
+    placeholder: >
+      Example: No error is thrown.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Actual Behavior
+    description: |
+      A clear and concise description of what actually happened. If you observe an error, please paste the error message including the **full traceback** of the exception.
+    placeholder: >
+      Please paste or specifically describe the actual output or traceback.
+      ```pytb
+      Paste here your traceback.
+      ````
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Environment
+    render: shell
+    description: |
+      Please run the following and paste the output below.
+      ```python
+      import skore; skore.show_versions()
+      ```
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Discord server
+    url: https://discord.gg/SCknzSQW
+    about: Developers and users can be found on the Discord server

.github/ISSUE_TEMPLATE/doc_improvement.yml

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+name: Documentation improvement
+description: Create a report to help us improve the documentation. Alternatively you can just open a pull request with the suggested change.
+labels: ['documentation', 'needs-triage']
+
+body:
+- type: textarea
+  attributes:
+    label: Which part of the documentation needs improvement?
+    description: >
+      Provide a link to the documentation page and section, if possible.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe the problem found in the documentation
+    description: >
+      Tell us about the confusion introduced in the documentation.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Suggested improvement
+    description: >
+      Tell us how we could improve the documentation in this regard.
+- type: textarea
+  attributes:
+    label: Additional context
+    description: >
+      Add any other context about the documentation improvement here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new feature, or enhancement to an existing feature.
+labels: ['enhancement', 'needs-triage']
+
+body:
+- type: textarea
+  attributes:
+    label: Is your feature request related to a problem? Please describe.
+    description: >
+      A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like
+    description: >
+      A clear and concise description of what you want to happen.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe alternatives you've considered, if relevant
+    description: >
+      A clear and concise description of any alternative solutions or features you've considered.
+- type: textarea
+  attributes:
+    label: Additional context
+    description: >
+      Add any other context or screenshots about the feature request here.