Make numpy effectively an optional dependency for Oracle provider

Better fix to apache#23132

airflow/providers/oracle/hooks/oracle.py

@@ -16,12 +16,17 @@
 # specific language governing permissions and limitations
 # under the License.
 
+import math
 import warnings
 from datetime import datetime
 from typing import Dict, List, Optional, Union
 
 import cx_Oracle
-import numpy
+
+try:
+    import numpy
+except ImportError:
+    numpy = None  # type: ignore
 
 from airflow.hooks.dbapi import DbApiHook
 
@@ -211,9 +216,9 @@ def insert_rows(
                     lst.append("'" + str(cell).replace("'", "''") + "'")
                 elif cell is None:
                     lst.append('NULL')
-                elif isinstance(cell, float) and numpy.isnan(cell):  # coerce numpy NaN to NULL
+                elif isinstance(cell, float) and math.isnan(cell):  # coerce numpy NaN to NULL
                     lst.append('NULL')
-                elif isinstance(cell, numpy.datetime64):
+                elif numpy and isinstance(cell, numpy.datetime64):
                     lst.append("'" + str(cell) + "'")
                 elif isinstance(cell, datetime):
                     lst.append(

airflow/providers/oracle/provider.yaml

@@ -42,6 +42,9 @@ integrations:
     logo: /integration-logos/oracle/Oracle.png
     tags: [software]
 
+additional-extras:
+  numpy: numpy
+
 operators:
   - integration-name: Oracle
     python-modules: