Constraints only applied when ENTMOOT uses Gurobi (#86)

* Add files via upload

First take on ENTMOOT strategy - init and suggest_experiments functions implemented.

* Add files via upload

Fixed some of the documentation

* Update and rename emstrat.py to entmoot.py

Renaming

* Add files via upload

* Adding ENTMOOT test

* Turning off verbose logging

* Update __init__.py

* Update ci.yml

* Update entmoot.py

Changed default optimizer type to Gurobi, and added an error if constraints are applied when optimizer type is set to sampling.

* Update entmoot.py

Set default optimizer type back to sampling

summit/strategies/entmoot.py

@@ -218,6 +218,14 @@ def __init__(
             self.optimizer_type = optimizer_type
         else:
             self.optimizer_type = "sampling"  # default optimizer: sampling
+
+        if self.optimizer_type == "sampling" & self.constraints is not None:
+            raise ValueError(
+                "Constraints can only be applied when ENTMOOT is using \ 
+                global solver. Set optimizer_type = \"global\" or remove \
+                constraints."
+                )
+
         """
         Sets an initial points generator. Can be either
         - "random" for uniform random numbers,