Merge Message operator tests

[antvaset]

Merged tests from engine/.../CqlErrorsAndMessagingOperatorsTest.cql into CqlErrorsAndMessagingOperatorsTest.xml.

Keeping the CQL library with the following define's:

1. These are used in Java tests to test the engine messages (logs) produced by the Message operator with the 'Message', 'Warning', and 'Trace' severities:

TestMessageInfo
TestMessageWarn
TestMessageTrace

2. These are used in Java tests to test that the runtime throws when the severity is 'Error' (I also adjusted the Java tests for these define's so that they fail if the engine does not throw):

TestMessageError
TestErrorWithNullSource
TestErrorWithNullCode
TestErrorWithNullMessage

Note that the TestErrorWithNullCondition is not supposed to throw but the old test was passing because it didn't fail when the engine didn't throw:

define TestErrorWithNullCondition:
  Message(1, null, '1', 'Error', 'This is a message')

At the moment this is a draft and depends on #1401. Once I'm sure we can have Message calls with nulls without casts, I'll raise a corresponding PR to update cql-tests.

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