Implement JDBC method getImportedKeys with empty ResultSet

[joechu1]

Description

There are client applications that does not handle exceptions for unimplemented functions in a JDBC driver, and returns an error. One example of this is from Issue #8708. This pull request is to implement one of the needed metadata function call with an empty result set so that a client application can proceed with connecting to Trino.

Is this change a fix, improvement, new feature, refactoring, or other?
An improvement

Is this a change to the core query engine, a connector, client library, or the SPI interfaces? (be specific)
Client library / JDBC driver

How would you describe this change to a non-technical end user or system administrator?
Improves compatibility with client applications using the Trino JDBC driver

Related issues, pull requests, and links

Documentation

( ) No documentation is needed.
( ) Sufficient documentation is included in this PR.
( ) Documentation PR is available with #prnumber.
( ) Documentation issue #issuenumber is filed, and can be handled later.

Release notes

( ) No release notes entries required.
( ) Release notes entries required with the following suggested text:

# Section
* Fix some things. ({issue}`issuenumber`)

[findepi]

OK implementation per #8708 (comment)