Improvements Dsn::class, fix phpdoc, add more tests.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

• Added Dsn class to support sqlite connection
• Fixed phpdoc in ConnectionPDO::getSchema() method
• Updated tests for new features and fixed some bugs there (see commit message)

[codecov]

Codecov Report

Base: 98.05% // Head: 98.07% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (ca09e93) compared to base (e47c4cd).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #170      +/-   ##
============================================
+ Coverage     98.05%   98.07%   +0.01%     
- Complexity      322      324       +2     
============================================
  Files            16       17       +1     
  Lines           978      986       +8     
============================================
+ Hits            959      967       +8     
  Misses           19       19              

Impacted Files	Coverage Δ
src/Dsn.php	100.00% <100.00%> (ø)

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