Add refreshUser() method to SessionAuthAdapter

[armanist]

Closes #329

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.49%. Comparing base (67e20fb) to head (17567cb).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Libraries/Auth/Adapters/JwtAuthAdapter.php	85.71%	1 Missing ⚠️
src/Libraries/Auth/Adapters/SessionAuthAdapter.php	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #330   +/-   ##
=========================================
  Coverage     80.48%   80.49%           
- Complexity     2410     2412    +2     
=========================================
  Files           228      228           
  Lines          6309     6317    +8     
=========================================
+ Hits           5078     5085    +7     
- Misses         1231     1232    +1     

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