Python: Add tests for peewee

Author: RasmusWL

python/ql/test/library-tests/frameworks/peewee/ConceptsTest.expected

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+import python
+import experimental.meta.ConceptsTest

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

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+argumentToEnsureNotTaintedNotMarkedAsSpurious
+untaintedArgumentToEnsureTaintedNotMarkedAsMissing
+failures

python/ql/test/library-tests/frameworks/peewee/InlineTaintTest.expected

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+import experimental.meta.InlineTaintTest

python/ql/test/library-tests/frameworks/peewee/InlineTaintTest.ql

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+import peewee
+import playhouse.pool
+
+# This is just one example of one of the support databases
+# see https://docs.peewee-orm.com/en/latest/peewee/database.html
+db = peewee.MySQLDatabase()
+
+conn = db.connection()
+cursor = conn.cursor()
+cursor.execute("sql")  # $ MISSING: getSql="sql"
+
+cursor = db.cursor()
+cursor.execute("sql")  # $ MISSING: getSql="sql"
+
+db.execute_sql("sql")  # $ MISSING: getSql="sql"
+
+# Pool extension
+pool = playhouse.pool.PooledMySQLDatabase(...)
+pool.execute_sql("sql")  # $ MISSING: getSql="sql"