Add Info/PaymentAccounts list + tests

[hjeldin]

Implementation of Info/PaymentAccounts list for #44
Instantiating a class by it's name is not elegant but gets the work done.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +2.30% 🎉

Comparison is base (4de15c3) 89.43% compared to head (12633c3) 91.73%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #54      +/-   ##
============================================
+ Coverage     89.43%   91.73%   +2.30%     
- Complexity      246      248       +2     
============================================
  Files            28       28              
  Lines           738      968     +230     
============================================
+ Hits            660      888     +228     
- Misses           78       80       +2     

Files Changed	Coverage Δ
src/Api/Info.php	100.00% <100.00%> (ø)
src/Entities/Info/InfoList.php	100.00% <100.00%> (ø)

... and 15 files with indirect coverage changes

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