Deprecate AbstractArrayUserType, BigintArrayUserType, and TextArrayUserType for removal

[sleberknight]

Hibernate 6 supports arrays natively now, so there is no longer a need for us to have custom array UserType classes in kiwi.

Deprecate this and its two sub-classes for removal in a future version.

For information on Hibernate 6's support for arrays, see Collections mapped to SQL arrays in An Introduction to Hibernate 6.

Another resource is: https://in.relation.to/2022/06/24/hibernate-orm-61-features/

In addition, there is an issue using this starting after Postgres 14 where we encountered a ClassCastException when using these custom types in our entity classes. Here are a few of the resources I found:

• Add support for Hibernate 6.4 vladmihalcea/hypersistence-utils#685
• https://discourse.hibernate.org/t/collection-usertypes-cause-a-cast-exception-in-6-4/8752
• https://hibernate.atlassian.net/browse/HHH-17588
• https://hibernate.atlassian.net/browse/HHH-17625

So, these custom user types stop working when using Hibernate 6 and Postgres 15+. Another reason to remove them.

[sleberknight]

The actual exception message included the following:

ArrayUserTypesIntegrationTest.beforeAll:36 » ClassCast class org.hibernate.type.CustomType cannot be
                cast to class org.hibernate.type.BasicPluralType (org.hibernate.type.CustomType and
                org.hibernate.type.BasicPluralType are in unnamed module of loader 'app')