Implement automatic retry with exponential backoff (up to 30 attempts)
for 502/503/504 errors. Prevents container crash-loop during server
outages, reducing kernel log spam from repeated restarts.
Add dynamic column width alignment for library names up to 30 chars.
Prevents excessive whitespace when library names vary significantly
in length while maintaining readability for typical names.
Please add some escaping in password env, I have password similar "xxxx&zzzz", and "&" broke syncing:
```
2023-10-16 12:50:04,655 Listing local libraries: seaf-cli list
2023-10-16 12:50:05,108 Syncing library btsync: seaf-cli sync -l 3XX2-XXX-2eXXea -s https://xxxxxxxx.xx -d /dsc/seafile/btsync -u xxx@xx.xx -p ********
-bash: line 1: zzzz: command not found
Traceback (most recent call last):
File "/usr/bin/seaf-cli", line 1023, in <module>
main()
File "/usr/bin/seaf-cli", line 1019, in main
args.func(args)
File "/usr/bin/seaf-cli", line 675, in seaf_sync
token = get_token(url, username, password, tfa, conf_dir)
```
