feat: API 56, new methods

[dschach]

This updates API to 56 and replaces test assertions with the new Assert class

feat: Add available record type maps
Return only RTs available to running user

[codecov]

Codecov Report

Base: 100.00% // Head: 98.48% // Decreases project coverage by -1.52% ⚠️

Coverage data is based on head (5f718ab) compared to base (4ad4046).
Patch coverage: 90.00% of modified lines in pull request are covered.

❗ Current head 5f718ab differs from pull request most recent head a3bdbc3. Consider uploading reports for the commit a3bdbc3 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #27      +/-   ##
===========================================
- Coverage   100.00%   98.48%   -1.52%     
===========================================
  Files            1        1              
  Lines          112      132      +20     
===========================================
+ Hits           112      130      +18     
- Misses           0        2       +2     

Flag	Coverage Δ
Apex	98.48% <90.00%> (-1.52%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
force-app/main/default/classes/RecordTypes.cls	98.48% <90.00%> (-1.52%)	⬇️

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