Support query pass-through for JDBC and Elasticsearch connectors

[kasiafi]

This PR introduces "query pass-through" Polymorphic Table Functions for Elasticsearch and JDBC-based connectors.

List of connectors supporting the remote_query function:

• Elasticsearch
• Druid
• MemSql
• MySql
• Oracle
• PostgreSql
• Redshift
• SqlServer
• MariaDB

not yet implemented:

• ClickHouse
• Phoenix

[findepi]

What happens when the remote_query is called with an INSERT or CREATE TABLE statement?

[kasiafi]

What happens when the remote_query is called with an INSERT or CREATE TABLE statement?

It should fail; I'll add tests.

[kasiafi]

Closing in favour of #12324 and #12325

[kasiafi]

What happens when the remote_query is called with an INSERT or CREATE TABLE statement?
It should fail; I'll add tests.

I added tests with CREATE and INSERT statements in #12325. I will add similar tests for Elasticsearch, too.