Add support for snapshots and interactive console

[Typhlos]

These commits add support for:

• Creating, listing and restoring snapshots
• Opening an interactive console

[IceManGreen]

@Typhlos please provide more information about :

• ✅ the behavior of the feature you implemented (summary)
• ❌ the commands that trigger your new feature
• ❌ the expected state / logs / results of the feature execution (some technical details)

[Typhlos]

This pull request provides 4 new cli commands :

freyja machine console vm

It opens an interactive console in the specified vm. It returns an error if the vm is not found.

freyja machine snapshot vm snapshot_name

Creates a snapshot with the specified name of the specified vm. It returns nothing on success and returns an error if the vm is not found.

freyja machine restore vm snapshot_name

Restores a snapshot with the specified name of the specified vm. It asks for confirmation. It returns nothing on success and returns an error if the vm or the snapshot is not found.

freyja machine list-snapshots vm

Lists all the available snapshots of the specified vm. It returns an error if the vm is not found.

This PR also updates the documentation to add those cli commands.

[IceManGreen]

Implementation is good.

@Typhlos the commits :

• d8e9d84
• 4e34ea5
• 080cc84

misses your signature.

Proceedure :

• configure your signing key for git commits
• run git rebase --exec 'git commit --amend --no-edit -n -S -s' -i <commit hash>

[Typhlos]

Implementation is good.

@Typhlos the commits :

• d8e9d84
• 4e34ea5
• 080cc84

misses your signature.

Proceedure :

• configure your signing key for git commits
• run git rebase --exec 'git commit --amend --no-edit -n -S -s' -i <commit hash>

It should be done