[SEDONA-579] Add ST_AsHEXEWKB

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a JIRA ticket?

• Yes, the URL of the associated JIRA ticket is https://issues.apache.org/jira/browse/SEDONA-579. The PR name follows the format [SEDONA-579] my subject.

What changes were proposed in this PR?

Add ST_AsHEXEWKB

How was this patch tested?

Passed local tests

Did this PR include necessary documentation updates?

• Yes, I am adding a new API. I am using the current SNAPSHOT version number in vX.Y.Z format.