Better way(s) of reaching repo admins

[thejcannon]

There are circumstances we want to reach repo admins out in the wild. These include asking about the community survey, or prompting feedback on features. As such, it'd be great if we had a way to identify and prompt repo admins from within Pants itself.

The current thinking is roughly:

• See if pants.toml is being changed in Version Control AND see if the Pants version is being changed
• If so, see if the current VCS user has committed a change to pants.toml prior that bumped the version
• If so this person is likely a repo admin

As far as toggleable behavior goes, we most likely want to to show/hide the messages based on some subsystem/option. This allows:

• non repo-admins or people who are repo admins but didn't bump versions to "subscribe"
• Repo admins who don't want messaging to turn it off

(But by default we can use the heuristic above)

How we know what messages to send and when is TBD.

[benjyw]

When do we invoke that functionality? Not sure we want a git operation on every pants invocation