…as a function

E.g., if Box entity has field "length", "delete from Box where length = 1" fails
This commit fixes it.

To do:
- fix copyright headers

Tests with entityManager for SELECT, UPDATE, DELETE with implicit variable

* fix tests in AbstractGrammarValidatorTest for invalid numeric literals. Simplified my previous changes. Recompute word type after reverting functions without arguments. This avoids a literal would be parsed as a number
* fix test advanced.JUnitJPQLModifyTest.updateUnqualifiedAttributeInWhere. An implicit variable was incorrectly added in a nested statement, in which an explicit variable was defined

Moved the check for invalid expression to general places in expression and factory.

This method is no longer needed in NumericLiteral after fixes in the previous commit.

Uses existing Room entity with a field named "length"

Note: the test "JUnitJPQLJakartaDataNoAliasTest.tesUpdateQueryWithThisVariable" is still failing