feat: Add support for using JDBC Catalog for Iceberg testing

[devinrsmith]

Fixes #6029

[devinrsmith]

Note to @lbooker42 , the mismatch between signature of getTableDefinition and readTable.

[lbooker42]

LGTM

[malhotrashivam]

Can you please use Junit4 instead of Junit5, because for my case, I will be writing deephaven tables to iceberg, and for creating these tables, I would need an execution context which so far I have been using with Junit4 using

    @Rule
    public final EngineCleanup framework = new EngineCleanup();

Let me know if I am missing something.

[devinrsmith]

It should be super simple to create JUnit 5 tests using the same logic; I don't think it's unreasonable to do this:

    private EngineCleanup engineCleanup = new EngineCleanup();

    @BeforeEach
    void setUp() throws Exception {
        engineCleanup.setUp();
    }

    @AfterEach
    void tearDown() throws Exception {
        engineCleanup.tearDown();
    }
}

We could create a JUnit 5 extension to make it just as easy as @Rule (I think I've done this on some branch, but I forget where...).

I really really really think we should be preferring JUnit 5 for new tests going forward.

I've updated io.deephaven.iceberg.junit5.CatalogAdapterBase to use EngineCleanup in anticipation of the ticking testing that should be upcoming.

[malhotrashivam]

Makes sense, thanks!