Support for conditions on type aliases

[SimonCockx]

Based on this contribution which adds syntactical support for conditions on type aliases, we should enhance our validator generator so it properly uses those conditions.

Example: let's say we want to define a string type that must have an odd number of characters and consists out of a specific configurable amount of words:

typeAlias MyAlias(numberOfWords int):
  OtherAlias(true)

  condition MustHaveSpecificNumberOfWords:
    GetNumberOfWords = numberOfWords

typeAlias OtherAlias(isOddLength boolean):
  string

  condition LengthIsOdd:
    if isOddLength
    then CheckLengthIsOdd

type Foo:
  attr1 MyAlias(2) (1..1)
  attr2 MyAlias(3) (0..*)

This should:

• generate condition classes for the conditions on MyAlias and OtherAlias,
• call these conditions in the type format validator of Foo.

Note that these alias conditions must be parameterized accordingly, so they will not implement the Validator<String> interface.

Prerequisites:

• Syntax contribution from TradeHeader: Adding condition support in typeAlias #909
• Injection support for validators: Type format validators and cardinality validators should be injected #927

[SimonCockx]

We should also add documentation.