Add poly_design example

test-data/ert/poly_design/POLY_EVAL

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+EXECUTABLE poly_eval.py

test-data/ert/poly_design/poly.ert

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+QUEUE_SYSTEM LOCAL
+QUEUE_OPTION LOCAL MAX_RUNNING 10
+
+RUNPATH poly_out/realization-<IENS>/iter-<ITER>
+
+REALIZATION_MEMORY 50mb
+
+NUM_REALIZATIONS 10
+MIN_REALIZATIONS 1
+
+GEN_DATA POLY_RES RESULT_FILE:poly.out
+
+DESIGN_MATRIX poly_design.xlsx DESIGN_SHEET:DesignSheet01 DEFAULT_SHEET:DefaultSheet
+
+INSTALL_JOB poly_eval POLY_EVAL
+FORWARD_MODEL poly_eval

test-data/ert/poly_design/poly_eval.py

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+#!/usr/bin/env python3
+import json
+
+
+def _load_coeffs(filename):
+    with open(filename, encoding="utf-8") as f:
+        return json.load(f)["DESIGN_MATRIX"]
+
+
+def _evaluate(coeffs, x):
+    return coeffs["a"] * x**2 + coeffs["b"] * x + coeffs["c"]
+
+
+if __name__ == "__main__":
+    coeffs = _load_coeffs("parameters.json")
+    output = [_evaluate(coeffs, x) for x in range(10)]
+    with open("poly.out", "w", encoding="utf-8") as f:
+        f.write("\n".join(map(str, output)))