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Add side_by_side mode to update_materialized_view #419

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Run time

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Job	Run time
Lint with Standard	13s
Ruby 3.4, Rails 8.0	1m 22s
Ruby 3.4, Rails 7.2	1m 27s
Ruby 3.3, Rails 8.0	1m 27s
Ruby 3.3, Rails 7.2	1m 31s
Ruby 3.4, Rails main	1m 55s
Ruby head, Rails main	2m 45s
	10m 40s