Create folder access-keys when initializing RODA for the first time

[hmiguim]

Steps to replicate:

1. Startup RODA
2. Login go to Adminstration > Users & groups
3. Select a user
4. Click on Edit

The following error will occur:

2023-11-08 10:58:57,406 [http-nio-8080-exec-2] ERROR org.roda.core.model.ModelService - Could not find any access token to list: Could not list contents of entity because it doesn't exist: /roda/data/storage/access-keys
org.roda.core.data.exceptions.NotFoundException: Could not list contents of entity because it doesn't exist: /roda/data/storage/access-keys
	at org.roda.core.storage.fs.FSUtils.listPath(FSUtils.java:452)
        (...)
Caused by: java.nio.file.NoSuchFileException: /roda/data/storage/access-keys
	at java.base/sun.nio.fs.UnixException.translateToIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newDirectoryStream(Unknown Source)
	at java.base/java.nio.file.Files.newDirectoryStream(Unknown Source)
	at org.roda.core.storage.fs.FSUtils.listPath(FSUtils.java:415)
	... 51 common frames omitted

Solution:

Create the folder access-keys during the first initialization of RODA storage