Auto merge of #9970 - ehuss:issue-template-forms, r=alexcrichton

Use forms for issue templates.

This switches the GitHub issue templates to use the new forms functionality.  This makes it so that the user doesn't need to fuss with editing the placeholder text, and instead can just start writing text.

I'm mostly just curious how this will work out. If people have trouble with it, or there are complaints, it can be reverted pretty easily.

Author: bors

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+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

@@ -0,0 +1,27 @@
+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

@@ -0,0 +1,50 @@
+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.