default compiler impl for get_from_hint_text

[Myles1]

This is the same as the mssql and mysql compilers in sqlalchemy
mssql-impl
mysql-impl

This lets you use features like timetravel in Snowflake-SqlAlchemy with:

>>> from sqlalchemy.engine import url
>>> from sqlalchemy import table, column, select

>>> t = table('my_table', column('q'))
>>> stmt = select([t]).with_hint(t, "BEFORE(TIMESTAMP => current_timestamp())")

>>> sf_dialect = url.URL("snowflake").get_dialect()()
>>> print(stmt.compile(dialect=sf_dialect))

SELECT my_table.q 
FROM my_table BEFORE(TIMESTAMP => current_timestamp())

[Myles1]

@sfc-gh-kwagner Would you be able to take a quick look at this?

[Myles1]

@sfc-gh-mkeller Are public pull requests not accepted by snowflake?