[BUG] Sqlparser fails to parse no standard escape chars.

[ayushdg]

What happened: When running test_rex.py::test_like one specific case fails with parsing errors due to escaping on non standard char 'Ä'.

What you expected to happen: The operation succeeds.

Minimal Complete Verifiable Example:

df = c.sql(f"""
         SELECT * FROM {input_table}
         WHERE a LIKE 'Ä%Ä_Ä%' ESCAPE 'Ä'
    """)

Anything else we need to know?:

Environment:

• dask-sql version: from #751
• Python version:3.9
• Operating System: ubuntu 18.04
• Install method (conda, pip, source): source