fix: Fix client generation with composite types

[aschulz90]

Client generation with schemas containing composite types was failing with this error:

dart run orm generate --debug

Unhandled exception:
type 'Null' is not a subtype of type 'bool' in type cast
#0      _$FieldFromJson (package:orm/src/dmmf/dmmf.g.dart:146:40)
#1      new Field.fromJson (package:orm/src/dmmf/dmmf.dart:385:7)
#2      _$ModelFromJson.<anonymous closure> (package:orm/src/dmmf/dmmf.g.dart:108:29)
#3      MappedListIterable.elementAt (dart:_internal/iterable.dart:413:31)
#4      ListIterator.moveNext (dart:_internal/iterable.dart:342:26)
#5      new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189:27)
#6      new _GrowableList.of (dart:core-patch/growable_array.dart:150:28)
#7      new List.of (dart:core-patch/array_patch.dart:51:28)
#8      ListIterable.toList (dart:_internal/iterable.dart:213:44)
#9      _$ModelFromJson (package:orm/src/dmmf/dmmf.g.dart:109:12)
#10     new Model.fromJson (package:orm/src/dmmf/dmmf.dart:278:7)
#11     _$DatamodelFromJson.<anonymous closure> (package:orm/src/dmmf/dmmf.g.dart:94:29)
#12     MappedListIterable.elementAt (dart:_internal/iterable.dart:413:31)
#13     ListIterator.moveNext (dart:_internal/iterable.dart:342:26)
#14     new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189:27)
#15     new _GrowableList.of (dart:core-patch/growable_array.dart:150:28)
#16     new List.of (dart:core-patch/array_patch.dart:51:28)
#17     ListIterable.toList (dart:_internal/iterable.dart:213:44)
#18     _$DatamodelFromJson (package:orm/src/dmmf/dmmf.g.dart:95:12)
#19     new Datamodel.fromJson (package:orm/src/dmmf/dmmf.dart:224:7)
#20     _$DocumentFromJson (package:orm/src/dmmf/dmmf.g.dart:10:28)
#21     new Document.fromJson (package:orm/src/dmmf/dmmf.dart:30:7)
#22     GenerateCommand.run (file:///C:/Users/andrs/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/orm-2.4.4/bin/src/commands/generate_command.dart:151:36)
<asynchronous suspension>
#23     CommandRunner.runCommand (package:args/command_runner.dart:209:13)
<asynchronous suspension>
#24     main (file:///C:/Users/andrs/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/orm-2.4.4/bin/orm.dart:69:5)
<asynchronous suspension>

The problem was, that isUpdatedAt doesn't exist on type (as mentioned in the comment), but wasn't nullable.
After the change the client was generated successfuly and was working as intended.

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Name	Status	Preview	Updated
prisma-dart	✅ Ready (Inspect)	Visit Preview	Dec 5, 2022 at 10:15AM (UTC)

[medz]

@aschulz90 THX