Export user defined type change checker

[jribbink]

This needs to be used in the Flow CLI for preliminary staging validation, would be useful to have this exported if there are any changes in the future/elimates code duplication.

re. onflow/flow-cli#1495

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.89%. Comparing base (2a63347) to head (e56bb1f).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           feature/stable-cadence    #5633      +/-   ##
==========================================================
- Coverage                   57.33%   55.89%   -1.44%     
==========================================================
  Files                         885     1049     +164     
  Lines                       88736   103206   +14470     
==========================================================
+ Hits                        50876    57689    +6813     
- Misses                      33944    41122    +7178     
- Partials                     3916     4395     +479     

Flag	Coverage Δ
unittests	55.89% <100.00%> (-1.44%)	⬇️

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