Add in support for backup status reporting to slack

[cwb124]

Would be awesome that whenever a scheduled backup was run, it would notify slack of the status and if failed, the error.

[stale[bot]]

This issue has been automatically marked as abandoned because it has not seen any activity or updates in 30 days. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as abandoned because it has not seen any activity or updates in 30 days. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[abc516]

Hi @jhunt @cwb124 do you need someone to tackle this issue?

[fabu-khiarah]

Bump!