[Spark] Migrate logging code to use Spark Structured Logging #3293
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Which Delta project/connector is this regarding?
Description
Migrate Delta's logging code to use Spark structured logging. Structured logging will be introduced in Spark 4.0, as highlighted in the preview release of Spark 4.0 | Apache Spark. Note that the feature is turned off by default and the output log message will remain unchanged.
Resolves #3145
How was this patch tested?
Existing tests.
Does this PR introduce any user-facing changes?
No