Allow int and string (composite) primary keys

[dkaera]

Closes #164

[codecov]

Codecov Report

Merging #181 into develop will increase coverage by 0.09%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #181      +/-   ##
===========================================
+ Coverage    77.42%   77.52%   +0.09%     
===========================================
  Files           48       49       +1     
  Lines         1360     1366       +6     
===========================================
+ Hits          1053     1059       +6     
  Misses         307      307

Impacted Files	Coverage Δ
floor/lib/src/adapter/migration_adapter.dart	100% <ø> (ø)	⬆️
floor/lib/src/util/primary_key_helper.dart	100% <100%> (ø)
floor/lib/src/adapter/deletion_adapter.dart	85% <100%> (+0.78%)	⬆️
floor/lib/src/adapter/update_adapter.dart	85% <100%> (ø)	⬆️
floor_generator/lib/writer/dao_writer.dart	100% <100%> (ø)	⬆️

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[vitusortner]

@dkaera Thank you for your contribution! I've just added test for the new functionality and changed the naming a bit.

[dkaera]

@dkaera Thank you for your contribution! I've just added test for the new functionality and changed the naming a bit.

You're welcome. I'm glad to help.