Migrate GitHub issue templates to issue forms

Author: noritada

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+name: Bug report
+description: Create a report to help us improve
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for filing a 🐛 bug report 😄!
+
+  - type: textarea
+    attributes:
+      label: Problem
+      description: |
+        A clear and concise description of what the bug is,
+        including what currently happens and what you expected to happen.
+
+  - type: textarea
+    attributes:
+      label: Steps
+      description: The steps to reproduce the bug.
+      placeholder: |
+        1.
+        2.
+        3.
+
+  - type: textarea
+    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
+    attributes:
+      label: Notes
+
+  - type: textarea
+    attributes:
+      label: Output of `rustup --version`
+
+  - type: textarea
+    attributes:
+      label: Output of `rustup show`

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Enhancement request
+description: Suggest an enhancement for this project
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for filing an 🙋 enhancement request 😄!
+
+  - type: textarea
+    attributes:
+      label: Problem you are trying to solve
+      description: |
+        A clear and concise description of the problem this enhancement request is trying to solve.
+
+  - type: textarea
+    attributes:
+      label: Solution you'd like
+      description: |
+        A clear and concise description of what you want to happen.
+
+  - type: textarea
+    attributes:
+      label: Notes
+      description: |
+        Any additional context or information you feel may be relevant to the issue.

.github/ISSUE_TEMPLATE/enhancement_request.md

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+name: I am experiencing a panic on WSL
+description: Report a panic when using Rustup on WSL
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please read the following very carefully and decide if you
+        actually need to file this bug...
+
+        WSL, specifically WSL 1, has a limitation where glibc 2.31 and
+        newer will panic, fundamentally the panic will look something
+        like the following:
+
+            thread 'main' panicked at 'assertion failed: `(left == right)`
+              left: `22`,
+             right: `4`', src/libstd/sys/unix/thread.rs:166:21
+
+        This is a bug, but it's a bug in WSL, not in Rust/Rustup and will
+        affect other programs built with Rust too.  Working around it
+        with Rustup will not help you until WSL (or glibc) is fixed.
+
+        This is known to affect:
+
+        * Ubuntu 20.04
+        * Arch Linux
+
+        But it may affect other versions of Linux on WSL1.
+
+        You can find more information on the WSL bug report here:
+
+        https://github.com/microsoft/WSL/issues/4898
+
+        If you're CERTAIN that you're not reporting yet another duplicate
+        of the above issue, then...
+
+        Thanks for filing a 🐛 bug report 😄!
+
+  - type: textarea
+    attributes:
+      label: Problem
+      description: |
+        A clear and concise description of what the bug is,
+        including what currently happens and what you expected to happen.
+
+  - type: textarea
+    attributes:
+      label: Steps
+      description: The steps to reproduce the bug.
+      placeholder: |
+        1.
+        2.
+        3.
+
+  - type: textarea
+    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
+    attributes:
+      label: Notes
+
+  - type: textarea
+    attributes:
+      label: Output of `rustup --version`
+
+  - type: textarea
+    attributes:
+      label: Output of `rustup show`