[Kernel][Defaults] Support `COALESCE` for all data types in the `DefaultExpressionHandler`

Feature request

Which Delta project/connector is this regarding?

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• [ ] Spark
• [ ] Standalone
• [ ] Flink
• [X] Kernel
• [ ] Other (fill in here)

Overview

#2415 adds support for COALESCE for boolean type expressions. We should support all data types.

Further details

#2415 already adds the needed changes. To support more data types we just need to add tests and remove the check that allows only boolean type in DefaultExpressionEvaluator.