Make getters and setters null-safety consistent [SPR-15792]

[spring-projects-issues]

Sébastien Deleuze opened SPR-15792 and commented

Ensure that null-safety is consistent between getters and setters in order to be able to provide beans with properties with a common type when type safety is taken in account, like with Kotlin via KT-10942.

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Issue Links:

• Introduce null-safety of Spring Framework API [SPR-15540] #20099 Introduce null-safety of Spring Framework API
• Extend null-safety to field level [SPR-15720] #20276 Extend null-safety to field level
• BeanDefinitionBuilder method arguments not annotated with @Nullable [SPR-15841] #20396 BeanDefinitionBuilder method arguments not annotated with @Nullable
• Consistent and efficient access to BeanDefinition argument values [SPR-16192] #20740 Consistent and efficient access to BeanDefinition argument values

Referenced from: commits 46eba3d, 9fc4fb1, fb4ddb0