JPA: automatically validate table and column names in entity beans

### Description

For projects that use JPA, NetBeans IDE offers the auto-completion of table and column names when you edit entity beans. Since the editor is already aware of that information, I wonder if it could also detect when a table or column name doesn't exist in the database, and then mark the failed `@Table` and `@Column` annotation.

Thank you!

#### How do I make auto-completion work?

I use Wildfly AS as application server, so this is what I do to get auto-completion:

1. In Wildfly AS, configure a data source.

1. In NetBeans IDE, configure a database in *Services → Databases* that uses exactly the same URL used to configure the data source in Wildfly AS. Then, connect to it.

1. In NetBeans IDE, configure Wildfly AS in *Services → Servers*.

1. In the Java project, in the persistence descriptor (`persistence.xml`), configure a persistence unit that uses the data source configured in Wildfly AS.

### Use case/motivation

The only motivation is to detect errors early, during the development phase, instead of discovering them at runtime.

### Related issues

_No response_

### Are you willing to submit a pull request?

No

### Code of Conduct

Yes

Start by tracing NetBeans' existing JPA entity-bean completion and how the persistence.xml data source is resolved. Define how database metadata should be checked for @Table and @Column names, then verify that nonexistent names are marked in the editor without disrupting existing completion.

Written by the indexing model from the issue text.