Adopt new GitHub Issues Forms syntax (swiftlang#5554)

Author: Kyle-Ye

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,39 @@
+name: Bug Report
+description: Something isn't working as expected
+labels: [bug]
+body:
+- type: textarea
+ attributes:
+ label: Description
+ validations:
+ required: true
+- type: textarea
+ attributes:
+ label: Expected behavior
+ description: What you expected to happen.
+ validations:
+ required: false
+- type: textarea
+ attributes:
+ label: Actual behavior
+ description: What actually happened.
+ validations:
+ required: false
+- type: textarea
+ attributes:
+ label: Steps to reproduce
+ placeholder: |
+ 1. ...
+ 2. ...
+ validations:
+ required: false
+- type: input
+ attributes:
+ label: Swift Package Manager version/commit hash
+ validations:
+ required: false 
+- type: textarea
+ attributes:
+ label: Swift & OS version (output of `swift --version && uname -a`)
+ validations:
+ required: false 

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

@@ -0,0 +1,39 @@
+name: Feature Request
+description: A suggestion for a new feature
+labels: [enhancement]
+body:
+- type: textarea
+ attributes:
+ label: Description
+ validations:
+ required: true
+- type: textarea
+ attributes:
+ label: Expected behavior
+ description: What you expected to happen.
+ validations:
+ required: false
+- type: textarea
+ attributes:
+ label: Actual behavior
+ description: What actually happened.
+ validations:
+ required: false
+- type: textarea
+ attributes:
+ label: Steps to reproduce
+ placeholder: |
+ 1. ...
+ 2. ...
+ validations:
+ required: false
+- type: input
+ attributes:
+ label: Swift Package Manager version/commit hash
+ validations:
+ required: false 
+- type: textarea
+ attributes:
+ label: Swift & OS version (output of `swift --version && uname -a`)
+ validations:
+ required: false