Add logout command

[synfinatic]

Fixes: #526

[codecov]

Codecov Report

Merging #533 (148d4bd) into main (7bd80dc) will increase coverage by 0.04%.
The diff coverage is 86.36%.

❗ Current head 148d4bd differs from pull request most recent head 75bdd00. Consider uploading reports for the commit 75bdd00 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #533      +/-   ##
==========================================
+ Coverage   80.60%   80.65%   +0.04%     
==========================================
  Files          24       24              
  Lines        2882     2904      +22     
==========================================
+ Hits         2323     2342      +19     
- Misses        492      494       +2     
- Partials       67       68       +1     

Files Changed	Coverage Δ
sso/awssso.go	68.83% <ø> (ø)
sso/awssso_auth.go	82.30% <86.36%> (+0.48%)	⬆️

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