feat: Changes for float32 in dbapi (#1115)

Author: ankiaga

google/cloud/spanner_dbapi/_helpers.py

@@ -40,6 +40,7 @@
     param_types.BOOL.code: 1,
     param_types.DATE.code: 4,
     param_types.FLOAT64.code: 8,
+    param_types.FLOAT32.code: 4,
     param_types.INT64.code: 8,
     param_types.TIMESTAMP.code: 12,
 }

google/cloud/spanner_dbapi/types.py

@@ -73,7 +73,7 @@ def __eq__(self, other):
 
 STRING = "STRING"
 BINARY = _DBAPITypeObject("TYPE_CODE_UNSPECIFIED", "BYTES", "ARRAY", "STRUCT")
-NUMBER = _DBAPITypeObject("BOOL", "INT64", "FLOAT64", "NUMERIC")
+NUMBER = _DBAPITypeObject("BOOL", "INT64", "FLOAT64", "FLOAT32", "NUMERIC")
 DATETIME = _DBAPITypeObject("TIMESTAMP", "DATE")
 ROWID = "STRING"