add database name as the Connection attribute

[cazorla19]

This change will add self.database as the Connection attribute displaying the database name from connection parameters.

I've described the reason for this change in #751 . Moreover, I believe that this attribute can be useful for other use-case where the info about the database name can be useful.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.88%. Comparing base (e2a908b) to head (ddc6675).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #752      +/-   ##
==========================================
+ Coverage   88.86%   88.88%   +0.02%     
==========================================
  Files           7        7              
  Lines         548      549       +1     
==========================================
+ Hits          487      488       +1     
  Misses         61       61              

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