As part of our SOC2/ISO certification, we need to be able to evidence a
list of "Standard Changes" for the DAML SDK project. This commit adds a
script that extracts, for a given month, the list of Standard Changes
that happened along with relevant information (author, reviewer, etc.).
It also adds a definition for a monthly cron job on Azure to run the
script and send the result to Slack, @-mentioning Martin.
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