Atomic view creation in view.sql

[RachM]

This PR changes the view creation to use create or replace view, which is atomic.

Previously, dbt-clickhouse would:

1. Create a new "temporary" view
2. Drop the current view (eek!)
3. Rename the new view to the current view

The above 3 steps aren't done in a single transactions, so any queries on the view that occur during the process may get errors that the view doesn't exist.

Ideally, the operations are done in a single, atomic operation. I.e. use create or replace view.

Summary

Checklist

Delete items not relevant to your PR:

• [ ] Unit and integration tests covering the common scenarios were added
• [ ] A human-readable description of the changes was provided to include in CHANGELOG
• [ ] For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

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