Missing LICENSE/NOTICE for Spark plugin #1627
Description
Describe the bug
The plugin under plugins/spark deserves its own LICENSE and NOTICE files, included in the generated uber jar, ensuring that the contents are correct and that the LICENSE and NOTICE files are the only ones and not ambiguous w/ other such files from other dependencies.
To Reproduce
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Actual Behavior
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Expected Behavior
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Additional context
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System information
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