Adds psalm static analysis

[gsteel]

No description provided.

[codecov]

Codecov Report

Merging #8 (c5d28a0) into main (8b182f7) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main        #8   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        13        15    +2     
===========================================
  Files              6         6           
  Lines             34        39    +5     
===========================================
+ Hits              34        39    +5     

Impacted Files	Coverage Δ
src/ConfigProvider.php	100.00% <ø> (ø)
src/AdminClientFactory.php	100.00% <100.00%> (ø)
src/BaseFactory.php	100.00% <100.00%> (ø)
src/ClientFactory.php	100.00% <100.00%> (ø)
src/Exception/MissingAccountKey.php	100.00% <100.00%> (ø)
src/Exception/MissingServerKey.php	100.00% <100.00%> (ø)

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[gsteel]

Because the abstract factory constructor is now marked final and the concrete factory classes are also final, this is effectively a BC break