feat: Update result_set.proto to return undeclared parameters in ExecuteSql API (#2101)

* feat: Update result_set.proto to return undeclared parameters in ExecuteSql API

PiperOrigin-RevId: 480025979

Source-Link: googleapis/googleapis@cb6fbe8

Source-Link: https://github.com/googleapis/googleapis-gen/commit/bf166b89d2a6aa3510374387af0f45e4828dea03
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