[Spark] Refactor out Delta read path #4041
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Which Delta project/connector is this regarding?
Description
Refactored out the following read path functionality:
This is a refactor-only change to support the single-pass Analyzer project in Spark: https://issues.apache.org/jira/browse/SPARK-49834.
It will be used in single-pass resolver extensions: https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/resolver/ResolverExtension.scala.
How was this patch tested?
Existing tests.
Does this PR introduce any user-facing changes?
No.