allow passing main arguments to lightgbm::lgb.train

[simonpcouch]

At the moment, train_lightgbm only passes elements from set_engine to elements in the params argument to lightgbm::lgb.train. This seems to be where most parameter adjustments happen, but some of the main arguments would be nice to be able to set as well.

library(bonsai)
data(penguins, package = "modeldata")

m <- boost_tree() %>%
  set_engine("lightgbm", nrounds = 100) %>%
  set_mode("regression") %>%
  fit(bill_length_mm ~ ., data = penguins)
#> [LightGBM] [Warning] Unknown parameter: nrounds

^{Created on 2022-05-02 by the reprex package (v2.0.1)}

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