context command to pin messages in respective thread #1188

[andrew-09]

#1188

Will give a warning message when the message is not in a thread, the user invoker is not the owner of the thread, or the number of pinned answers exceeds 10

[CLAassistant]

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[andrew-09]

Closing as I realized I commited under my old github username "Andrew1031" which caused issues with the CLA agreement on my last PR