* support async insert for native protocol
* use separate queue for async inserts via native protocol
* fix test
* better logging for async inserts and more tests
* disable mixed internal and external data in async inserts
* fix tests
* fix quota in async inserts
* disable async insert for secondary query of distributed
Accepts CH client queries in the form of
SHOW FUNCTIONS [LIKE | ILIKE '< pattern>']
Retrieves all columns from `functions` table in system database.
Fixes#52757