Make ClickHouse integration work with django-clickhouse-backend

[sentrivana]

Problem Statement

The ClickHouse integration doesn't create spans if used in Django via django-clickhouse-backend.

This first surfaced in #3088 where the whole integration would error out because _sentry_span was not set on the connection as expected. We're patching the integration to not do anything if _sentry_span is not there, but it'd be good to have proper support for django-clickhouse-backend.

Solution Brainstorm

Looks like the spans are not started the expected way (clickhouse_driver.connection.Connection.send_query is not called?), so we might need to wrap an additional function that django-clickhouse-backend uses to start queries.