Be able to announce a decision about adrust HOT 3 OPEN

@omallassi I think this is fantastic!

It would be great to see Mattermost or Zulip

A few things to consider:

• Suppression of the announcement when an decision is created adr lf new ... as that would create a notification without substance.
• Send a copy of the file with the announcement

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yes.
maybe we can think about having "kind of plugins" to support different "channels". no idea how we can do this in rust but a go opportunity to learn :)

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I think it would be interesting to develop a plugin system.

Choosing the plugin could be as easy as adr announce --decision <id||name> --plugin <plugin_name>

id being an idea from #36 as decision names could be long and typing an id preferable.

Additionally, the default plugin for the user could be defined in the config as adr_default_announce_plugIn

As far as implementation goes, I'm not an expert in rust by any means so correct me if I am wrong but we could create a trait (announce_plugin or something similar) and implement it for each of the plugin structs. This would allow for a unified interface for all announce_plugins...what do you think?

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