ci: add type checking (psalm)

[eKsiK]

No description provided.

[codecov]

Codecov Report

Merging #3 (3d3f590) into master (96a52b8) will not change coverage.
The diff coverage is 91.66%.

@@            Coverage Diff            @@
##             master       #3   +/-   ##
=========================================
  Coverage     78.04%   78.04%           
  Complexity      168      168           
=========================================
  Files            47       47           
  Lines           451      451           
=========================================
  Hits            352      352           
  Misses           99       99           

Impacted Files	Coverage Δ
src/Common/Builder/ServiceDtoBuilder.php	100.00% <ø> (ø)
src/Common/Dto/AbstractDto.php	100.00% <ø> (ø)
src/Common/Parser/ServiceResponseParser.php	100.00% <ø> (ø)
src/Confirmation/ValueObject/Confirmation.php	33.33% <ø> (ø)
src/Itn/Dto/ItnDto.php	50.00% <0.00%> (ø)
src/Transaction/ValueObject/Transaction.php	87.50% <ø> (ø)
src/Client.php	100.00% <100.00%> (ø)
src/Hash/HashChecker.php	100.00% <100.00%> (ø)
src/Itn/Builder/ItnDtoBuilder.php	100.00% <100.00%> (ø)
src/PaywayList/Dto/PaywayListDto.php	100.00% <100.00%> (ø)
... and 5 more

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