Integrated "SessionFactory" class into the "IsolatedSessionStrategy" class

[aik099]

Closes #48

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.82%. Comparing base (c621fe2) to head (2588d78).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #132      +/-   ##
============================================
- Coverage     86.21%   82.82%   -3.39%     
+ Complexity      328      326       -2     
============================================
  Files            29       28       -1     
  Lines           863      856       -7     
============================================
- Hits            744      709      -35     
- Misses          119      147      +28     

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