Hello,

I have recently noticed that a lot of connections with certain special characters don't work with SqlAlchemy as it requires the passwords to be [urlencoded when they contain special characters](https://stackoverflow.com/questions/1423804/writing-a-connection-string-when-password-contains-special-characters). 

Would there be any impact to changing the code at line 81 to urlencode the password like `urllib.parse.quote_plus(conn.password)` to prevent login failures for special characters? 

https://github.com/apache/airflow/blob/dee304b222d355b03794aa063f39e3ee13997730/airflow/hooks/dbapi_hook.py#L72-L88

I initially caught this issue while using the OdbcHook method found here. https://github.com/apache/airflow/blob/dee304b222d355b03794aa063f39e3ee13997730/airflow/providers/odbc/hooks/odbc.py#L198-L204

Happy to create a feature request, I just want to confirm that this issue makes sense. 


tests/hooks/test_dbapi_hook.py
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import unittest
from unittest import mock
from airflow.hooks.dbapi_hook import DbApiHook
from airflow.models import Connection
class TestDbApiHook(unittest.TestCase):