[SPARK-49709][CONNECT][SQL] Support ConfigEntry in the RuntimeConfig interface #49062
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What changes were proposed in this pull request?
This PR adds support for ConfigEntry to the RuntimeConfig interface. This was removed in #47980.
Why are the changes needed?
This functionality is used a lot by Spark libraries. Removing them caused friction, and adding them does not pollute the RuntimeConfig interface.
Does this PR introduce any user-facing change?
No. This is developer API.
How was this patch tested?
I have added tests cases for Connect and Classic.
Was this patch authored or co-authored using generative AI tooling?
No.