Add escape like helper

[gaborbernat]

This helper method should be part of the lib:

def escape_like(text: str) -> str:
    """Escape text for like.

    :param text: the raw text
    :return: escaped text
    """
    return text.replace("%", "\\%").replace("_", "\\%")

Example of other frameworks having this https://sqlalchemy-utils.readthedocs.io/en/stable/orm_helpers.html#escape-like