Maksymilian Pawlak 33e45eef4a CORDA-1297 - Columns nullability (#3112) -> V3 (#3303)
* [CORDA-1297] Columns nullability (#3112)

JPA/Hibernate entities need to impose the correct NULL/NOT NULL constraints on the database - whatever these correct values actually are.
API change: net.corda.core.schemas.PersistentStateRef fields (index and txId) are now non-nullable. Rationale: The fields were always effectively non-nullable - values were set from non-nullable fields of other objects. The class is used in context of database table Primary Key of for other entities and a database already imposes those columns as non-nullable (even if JPA annotation nullable=false was absent).

(cherry picked from commit 7d69bc6)

* Compilation fix
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