Chore: Script to generate betterer issue summary (#61857)

* wip

* finish script

* limit by message

* fix filter message

* Add template

* improve template

* codeowners devdep

scripts/cli/bettererIssueTemplate.md

@@ -0,0 +1,7 @@
+Hi <%= owner %>!
+
+The following files have been marked as having issues regarding `<%= issueFilter %>: <%= issueMessageFilter %>`.
+
+There are <%= totalIssueCount %> <%= plural('issue', totalIssueCount) %> over <%= fileCount %> <%= plural('file', fileCount) %>:
+<% files.forEach((file) => { %>
+- [ ] <%= file.issueCount %> <%= plural('issue', file.issueCount) %> in `<%= file.fileName %>` <% }) %>