Add option to always save session

[0rzech]

This will allow to prolong session validity period with every valid request at the cost of higher session store write activity and adding set-cookie header to each response.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.80%. Comparing base (02e4c55) to head (5b4fff4).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/service.rs	63.63%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   84.54%   83.80%   -0.75%     
==========================================
  Files           5        5              
  Lines         343      352       +9     
==========================================
+ Hits          290      295       +5     
- Misses         53       57       +4     

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[maxcountryman]

Thanks for this!

[0rzech]

You're welcome and thank you for your hard work! 🚀 😃