Sort backups by the creation time in generic backup-list command

[usernamedt]

Thanks to this PR, WAL-G for Postgres sorts the backups in the output of the backup-list command by the creation time. However, it does that only when being called with the --detail flag.

It happens because WAL-G uses two different backup-list handlers:

1. Generic (same for all databases) when it is launched without the --detailed flag (source code)
2. Postgres-specific when being launched with the --detail flag (source code)

I think that WAL-G generic backup list handler should utilize the GenericMetadata to sort the backups by the creation time. For some databases, the appropriate adapters are already written: MySQL, Postgres, Greenplum. As for FDB, Redis, and SQLServer which also use the generic backup-list command handler currently there is no GenericMetadata adapter implemented.

So, I can see the following plan to implement this feature:

1. Implement the GenericMetaFetcher for FDB, Redis, and SQLServer.
2. Fetch the GenericMetadata in the backup-list command handler to sort the backup-list output by the creation time.

[OlleLarsson]

Hello @usernamedt, is this issue prioritized anywhere on your roadmap 😄 ?

[x4m]

There's a big chance that we need to recruit some other principal author for the feature.
Maybe @debebantur knows anyone, but anyway PR would be welcomed.

[debebantur]

Hello, we will try to find someone for this feature. If someone starts to implement it, I will write about it here. But any PR would be welcomed.