#149: Support NOT NULL columns via @Column(notNull=true)
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Defaulting ID fields to required (`NOT NULL`) can be enabled via a Java system property, `tech.ydb.yoj.repository.db.id.nullability`, which will influence the schema checker (`YdbSchemaCompatibilityChecker`), programmatic table creation via `YdbSchemaOperations`, and YQL code generation in `YqlStatement`s that take into account the `isOptional()` `JavaField` attribute. The new attribute is introduced by this change, so the only supporting code generators initially are the standard `YqlStatement` implementations. The valid System property values are: - `USE_COLUMN_ANNOTATION` (Default): Consider ID fields optional unless annotated with the `@Column(notNull=true, ...)` annotation or the `@NotNullColumn` meta-annotation. - `ALWAYS_NULL`: Force all ID fields to be treated as optional, even though YOJ does **not** allow to save entities with NULL in ID columns. - `ALWAYS_NOT_NULL`: Force all ID fields to be treated as required.
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