fix(save_manager): traverse remote folders with recursion

[CortezSMz]

Description

With this pull request you should be able to backup any folder from the switch regardles of the folder structure, even if heavily nested.

Fixes #41 and should also fix #18 and #23

Motivations:

Most games don't have a convention for folder structure on save data, making it impossible to guess how deep you have too look for save files.

Solution:

Traverse the folders with recursion while checking if it's a file and keeping track of current path and it's children. It also ignores empty foldes.

How has this been tested?

Tested with the following shop_config.tml:

folders = [
    {local = "Saves/Xance/Tinfoil", remote = "/switch/tinfoil/saves"},
    {local = "Saves/Xance/DBI", remote = "/switch/DBI/saves"},
    {local = "Saves/Xance/JKSV", remote = "/JKSV"},
    {local = "Album/Xance", remote = "/emuMMC/SD00/Nintendo/Album"},
    {local = "Album/Xance", remote = "/Nintendo/Album"},
]

Console output:

2023-09-20 16:42:03,599 - INFO apscheduler.scheduler: Added job "Backup saves" to job store "default"
2023-09-20 16:42:03,599 - INFO apscheduler.scheduler: Scheduler started
2023-09-20 16:42:03,608 - INFO apscheduler.executors.default: Running job "Backup saves (trigger: interval[0:10:00], next run at: 2023-09-20 16:42:03 UTC)" (scheduled at 2023-09-20 16:42:03.586925+00:00)
2023-09-20 16:42:03,658 - INFO save_manager: Successfully connected to Switch device on host 192.168.1.9.
2023-09-20 16:42:03,659 - INFO save_manager: Retrieving saves from from /switch/tinfoil/saves to Saves/Xance/Tinfoil
2023-09-20 16:42:04,142 - INFO save_manager: Retrieved 1 saves in 0.483s - from /switch/tinfoil/saves to Saves/Xance/Tinfoil
2023-09-20 16:42:04,142 - INFO save_manager: Retrieving saves from from /switch/DBI/saves to Saves/Xance/DBI
2023-09-20 16:42:04,225 - INFO save_manager: Retrieved 0 saves in 0.083s - from /switch/DBI/saves to Saves/Xance/DBI
2023-09-20 16:42:04,225 - INFO save_manager: Retrieving saves from from /JKSV to Saves/Xance/JKSV
2023-09-20 16:43:40,613 - INFO save_manager: Retrieved 291 saves in 96.388s - from /JKSV to Saves/Xance/JKSV
2023-09-20 16:43:40,614 - INFO save_manager: Retrieving saves from from /emuMMC/SD00/Nintendo/Album to Album/Xance
2023-09-20 16:44:19,622 - INFO save_manager: Retrieved 72 saves in 29.008s - from /emuMMC/SD00/Nintendo/Album to Album/Xance
2023-09-20 16:44:19,623 - INFO save_manager: Retrieving saves from from /Nintendo/Album to Album/Xance
2023-09-20 16:44:28,218 - INFO save_manager: Retrieved 29 saves in 8.595s - from /Nintendo/Album to Album/Xance
2023-09-20 16:44:28,219 - INFO apscheduler.executors.default: Job "Backup saves (trigger: interval[0:10:00], next run at: 2023-09-20 16:52:03 UTC)" executed successfully

[a1ex4]

Even if I can't test this currently, this looks good to me. Thanks for the contribution!