Use forms for issue templates.

Author: ehuss

.github/ISSUE_TEMPLATE/bug_report.md

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+name: Bug Report
+description: Create a report to help us improve
+labels: ["C-bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for filing a 🐛 bug report 😄!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: >
+        Please provide a clear and concise description of what the bug is,
+        including what currently happens and what you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps
+      description: Please list the steps to reproduce the bug.
+      placeholder: |
+        1.
+        2.
+        3.
+  - type: textarea
+    id: possible-solutions
+    attributes:
+      label: Possible Solution(s)
+      description: >
+        Not obligatory, but suggest a fix/reason for the bug,
+        or ideas how to implement the addition or change.
+  - type: textarea
+    id: notes
+    attributes:
+      label: Notes
+      description: Provide any additional notes that might be helpful.
+  - type: textarea
+    id: version
+    attributes:
+      label: Version
+      description: Please paste the output of running `cargo version --verbose`.
+      render: text

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Feature Request
+description: Suggest an idea for enhancing Cargo
+labels: ["C-feature-request"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for filing a 🙋 feature request 😄!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: >
+        Please provide a clear description of your use case and the problem
+        this feature request is trying to solve.
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: >
+        Please provide a clear and concise description of what you want to happen.
+  - type: textarea
+    id: notes
+    attributes:
+      label: Notes
+      description: Provide any additional context or information that might be helpful.

.github/ISSUE_TEMPLATE/feature_request.md

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+name: Tracking Issue
+description: A tracking issue for an accepted feature or RFC in Cargo.
+title: "Tracking Issue for _FEATURE_NAME_"
+labels: ["C-tracking-issue"]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thank you for creating a tracking issue! Tracking issues are for tracking an
+        accepted feature or RFC from implementation to stabilization. Please do not
+        file a tracking issue until the feature or RFC has been approved.
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: Please provide a very brief summary of the feature.
+      value: |
+        RFC: [#NNNN](https://github.com/rust-lang/rfcs/pull/NNNN) <!-- If this is an RFC -->
+        Original issue: #NNNN <!-- if there is a related issue that spawned this feature -->
+        Implementation: #NNNN <!-- link to the PR that implemented this feature if applicable -->
+        Documentation: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#my-feature
+
+        Please enter a short, one-sentence description here.
+    validations:
+      required: true
+  - type: textarea
+    id: unresolved
+    attributes:
+      label: Unresolved Issues
+      description: List issues that have not yet been resolved.
+      placeholder: |
+        * [ ] Make a list of any known implementation or design issues.
+  - type: textarea
+    id: future
+    attributes:
+      label: Future Extensions
+      description: >
+        An optional section where you can mention where the feature may be
+        extended in the future, but is explicitly not intended to
+        address.
+  - type: textarea
+    id: about
+    attributes:
+      label: About tracking issues
+      description: Please include this notice in the issue.
+      value: |
+        Tracking issues are used to record the overall progress of implementation.
+        They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
+        A tracking issue is however *not* meant for large scale discussion, questions, or bug reports about a feature.
+        Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.