chore: add stale bot

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 21
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 30
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - todo
+  - 'in progress'
+  - 'needs review'
+  - 'high priority'
+  - 'good first issue'
+
+# Label to use when marking an issue as stale
+staleLabel: inactive
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  Hi everyone! Seems like there hasn't been much going on in this issue lately.
+  If there are still questions, comments, or bugs, please feel free to continue
+  the discussion. Unfortunately, we don't have time to get to every issue. We
+  are always open to contributions so please send us a pull request if you would
+  like to help. Inactive issues will be closed after 30 days. Thanks!
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: >
+  Hey there, it's me again! I am going close this issue to help our maintainers
+  focus on the current development roadmap instead. If the issue mentioned is
+  still a concern, please open a new ticket and mention this old one. Cheers
+  and thanks for using Open Web Components!