Support SQLAlchemy syntax for show create table

[kuba--]

Signed-off-by: kuba-- kuba@sourced.tech
Fixes #594

[kuba--]

@erizocosmico - maybe we can add the script to integration tests - WDYT?

import pandas as pd
import sqlalchemy

engine = sqlalchemy.create_engine('mysql+pymysql://user:pass@127.0.0.1:3306/test')
with engine.connect() as conn:
    repo_df = pd.read_sql_table("mytable", con=conn)
    for table_name in repo_df.to_dict():
        print(table_name)

[ajnavarro]

@kuba-- LGTM.

Could you add to the script that you mentioned to integration tests on this PR to verify that SQLAlchemy is supported?

Also, don't forget to update SUPPORTED.md file

[kuba--]

@ajnavarro - Added integration test.