This module adds support for "codaclean" integration.
CODA files can be periodically (or on demand) fetched from codaclean
and imported into bank journals.
The module only connects to the IAP server.
The IAP side does the actual calls to codaclean (with a secret API key).

To use the module you have to create a connection to IAP / codaclean
and set up a bank journal:
- To manage the connection to IAP / codaclean go to
  Settings -> Accounting -> Codaclean -> Manage Connection
- To set up the bank journal you need to configure the following
  in the "Journal Entries" tab on the journal:
  - Put the IBAN in the "Bank Account Number" field
  - Select "Codaclean Synchronization" for the "Bank Feeds" field

Coda files will be automatically fetched 2 times per day via the
scheduled action called "Accounting: Sync Coda Files from Codaclean".
They can also be manually fetched by clicking "Fetch from Codaclean"
below the journal on the accounting dashboard (only available
when the journal and connection are setup correctly).

On an empty journal we start fetching from 1 year ago.
When the journal is not empty we start fetching after the last bank statement
/ bank statement line in the journal.

task-4844423

backport of commit 518ab9e