951 identify high miovision volumes

[gabrielwol]

What this pull request accomplishes:

• add a weekly notification about instances where miovision volumes have doubled week over week
• miovision_doubling_insert function logs instances of doubling in a table; then miovision_doubling_summary eliminates streaks and summarizes for airflow notification
• add as a new task to miovision_check once Reduce notification frequency to weekly #953 is merged.

Issue(s) this solves:

• Identify when Miovision volume are unusually high #951

What, in particular, needs to reviewed:

What needs to be done by a sysadmin after this PR is merged

• switch these functions+table to miovision schema