Add python cx_oracle, phoenixdb, pyodbc models

python/ql/test/library-tests/frameworks/cx_Oracle/ConceptsTest.ql

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+import python
+import experimental.meta.ConceptsTest

python/ql/test/library-tests/frameworks/cx_Oracle/pep249.py

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+import cx_Oracle
+connection = cx_Oracle.connect(user="hr", password="pwd",
+                               dsn="dbhost.example.com/orclpdb1")
+
+cursor = connection.cursor()
+cursor.execute("some sql")  # $ getSql="some sql"