Elephantusparvus

[SEDONA-142] Add ST_Collect to Flink Catalog

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## Did you read the Contributor Guide? - Yes, I have read [Contributor Rules](https://sedona.apache.org/community/rule/) and [Contributor Development Guide](https://sedona.apache.org/community/develop/) - Yes. ## Is this PR related to a JIRA ticket? -...

[PostgreSQL] Add DeserializationConverterFactory for PostGIS schemas

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This adds a simple DeserializationConverterFactory for PostgisGeometry objects, like it is done in with the com.ververica.cdc.connectors.mysql.table.MySqlDeserializationConverterFactory. But in the case of PostGIS the data is encoded in ewkb, which should...