Allow logical replication to copy tables in binary format

I see that logical replication subscriptions have an option to enable binary [1]. 

When it's enabled, subscription requests publisher to send data in binary format. 

But this is only the case for apply phase. In tablesync, tables are still copied as text.

To copy tables, COPY command is used and that command supports copying in binary. So it seemed to me possible to copy in binary for tablesync too.

I'm not sure if there is a reason to always copy tables in text format. But I couldn't see why not to do it in binary if it's enabled.

You can find the small patch that only enables binary copy attached.  

What do you think about this change? Does it make sense? Am I missing something?

[1] https://www.postgresql.org/docs/15/sql-createsubscription.html

Best,

Melih