Specify generic type in type *Meta classes to improve compilation performance

[hugohills-regnosys]

Specify generic type in type *Meta classes to improve compilation performance

Covered by tests:

• DataRuleGeneratorTest.shouldCheckConditionWithInheritedAttribute
• DataRuleGeneratorTest.shouldCheckConditionWithInheritedAttribute2
• DataRuleGeneratorTest.shouldCheckInheritedCondition

Type of change

• Bug fix (non-breaking change which fixes an issue)