Feature/providers

[pontusab]

Add support for more bank providers:

• Teller
• GoCardLess
• Plaid

Also expose a new package called @midday/providers that returns getTransactions and getAccounts, from outside it should only care about the provider name.

Transforms the data to a unified format for our data model.

Major rework on background jobs:

• Run 1 job each hour for each team with an enabled account
• Initial sync can be triggered manually from user settings (if connection expired etc)
• Send a combined notification for each teams accounts instead of each account