[R-package] consolidate duplicate lists of Dataset info keys #4381
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As part of adding a deprecation warning about the removal of
...support in the R package (per #4226 (comment)), I wanted to be able to give different warnings in items passed through...inlgb.Dataset()based on whether they are params (e.g.max_bin) or "info" elements (e.g.init_score).I realized that there are three duplicate places where the R package stores the list of valid keys for "info".
This PR proposes consolidating them into a single place, to reduce the risk of inconsistencies and simplify the code a bit.