Andrew Thia 9254c58e4d [TREE] add interaction constraints (#3466)
* add interaction constraints

* enable both interaction and monotonic constraints at the same time

* fix lint

* add R test, fix lint, update demo

* Use dmlc::JSONReader to express interaction constraints as nested lists; Use sparse arrays for bookkeeping

* Add Python test for interaction constraints

* make R interaction constraints parameter based on feature index instead of column names, fix R coding style

* Fix lint

* Add BlueTea88 to CONTRIBUTORS.md

* Short circuit when no constraint is specified; address review comments

* Add tutorial for feature interaction constraints

* allow interaction constraints to be passed as string, remove redundant column_names argument

* Fix typo

* Address review comments

* Add comments to Python test
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