Support all pandas nullable integer types. (#8480)

- Enumerate all pandas integer types.
- Tests for `None`, `nan`, and `pd.NA`

tests/python/test_quantile_dmatrix.py

@@ -10,6 +10,7 @@ from xgboost.testing import (
     make_batches_sparse,
     make_categorical,
     make_sparse_regression,
+    predictor_equal,
 )
 from xgboost.testing.data import np_dtypes
 
@@ -246,11 +247,7 @@ class TestQuantileDMatrix:
         for orig, x in np_dtypes(n_samples, n_features):
             m0 = xgb.QuantileDMatrix(orig)
             m1 = xgb.QuantileDMatrix(x)
-            csr0 = m0.get_data()
-            csr1 = m1.get_data()
-            np.testing.assert_allclose(csr0.data, csr1.data)
-            np.testing.assert_allclose(csr0.indptr, csr1.indptr)
-            np.testing.assert_allclose(csr0.indices, csr1.indices)
+            assert predictor_equal(m0, m1)
 
         # unsupported types
         for dtype in [