chore(repo): adopt vouch with issue based workflow and require for PRs (#3022)

Adopting [https://github.com/mitchellh/vouch](vouch) so we can help
potential contributors by requiring a conversation before they can
submit a PR. Too many contributors have been skipping the conversation
part of contributing to an OSS repo and skipping right ahead to
submitting PRs
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.github/ISSUE_TEMPLATE/vouch-request.yml

@@ -0,0 +1,28 @@
+name: Vouch Request
+description: Request to be vouched as a contributor
+labels: ["vouch-request"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ## Vouch Request
+
+        We use [vouch](https://github.com/mitchellh/vouch) to manage contributor trust. PRs from unvouched users are automatically closed.
+
+        To get vouched, fill out this form. A maintainer will review your request and vouch for you by commenting on this issue.
+  - type: textarea
+    id: context
+    attributes:
+      label: Why do you want to contribute?
+      description: Tell us a bit about yourself and what you'd like to work on.
+      placeholder: "I'd like to fix a bug I found in..."
+    validations:
+      required: true
+  - type: textarea
+    id: prior-work
+    attributes:
+      label: Prior contributions or relevant experience
+      description: Links to previous open source work, relevant projects, or anything that helps us understand your background.
+      placeholder: "https://github.com/..."
+    validations:
+      required: false