Honor --graphql.nested-create.enabled option for other database types

Related Issue : [#1950](https://github.com/Azure/data-api-builder/issues/1950)

At the moment, nested create operation is applicable only for MsSQL database type. So, the option `--graphql.nested-create.enabled` option is honored only for MsSQL. When nested create operation is supported for other database types, the option `--graphql.nested-create.enabled` has to be honored as well.

This issue tracks the effort needed for honoring the CLI option.

先阅读相关 issue #1950，了解其他数据库类型在什么情况下应支持嵌套创建。然后跟踪 CLI 选项 `--graphql.nested-create.enabled` 在嵌套创建实现和数据库特定路径中的处理。完成标准是：在支持嵌套创建的所有位置一致地遵循该选项，并且每种受支持的数据库类型都有覆盖。

由索引模型根据 Issue 内容生成。