Add new issue and PR templates

.github/ISSUE_TEMPLATE/01-bug-report.yml

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+name: Bug Report
+description: File a bug report.
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Confirm setup
+      description: By submitting this issue, you confirm to have done the following in preparation:
+      options:
+        - label: I have installed the development version of `{gptstudio}` (`pak::pak("MichelNivard/gptstudio")`) and tested if the problem remains.
+          required: true
+        - label: I have installed the `{reprex}` and `{sessioninfo}` packages to be able to run this issue's code snippet `pak::pak(c("reprex", "sessioninfo"))`.
+          required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: What happened?
+      description: |
+        Also tell us, what did you expect to happen? Be as verbose as possible.
+
+        Tip: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+      placeholder: Tell us what you see!
+      value: "I was trying to do X, and when I typed/clicked Y, I found the following problem:"
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: textarea
+    id: sessioninfo
+    attributes:
+      label: Session info
+      description: Please run `reprex::reprex(gptstudio::gptstudio_sitrep(), session_info = TRUE)` and paste the output here. It will provides us more context on your system.
+      render: r
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/MichelNivard/gptstudio?tab=coc-ov-file#).
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/02-feature-request.yml

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+name: Feature request
+description: Make a case for a new feature.
+title: "[FR]: "
+labels: ["feature"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this form!
+  - type: textarea
+    id: case
+    attributes:
+      label: What would you like to have?
+      description: |
+        Be as verbose as possible. You can use examples from other projects.
+
+        Tip: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+      placeholder: Let us know your thoughts!
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/MichelNivard/gptstudio?tab=coc-ov-file#).
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/pull_request_template.md

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+## Related issue
+
+- Closes #XX
+
+## Description of changes
+
+- 
+
+## For contributors
+
+- [] I have added the relevant changes to the NEWS.md file
+- [] I have added relevant tests or documentation with my changes
+
+## For reviewers
+
+- [] Changes meet the acceptance criteria of the related issue
+- [] The contribution follows style conventions and code of conduct
+- [] Branch passes automated testing
+- [] I have incremented the package version in the DESCRIPTION file before merging