support 3 part identifer for snowflake

[dlawin]

Snowflake: Allows specifying database as well when t1, t2 share a connection. Example:

t1 = connect_to_table(CONN_INFO, ("DEV", "DEV_SCHEMA", "TABLE"), "ID")
t2 = connect_to_table(CONN_INFO, ("PROD", "PROD_SCHEMA", "TABLE"), "ID")
diff = diff_tables(t1, t2, algorithm=Algorithm.JOINDIFF)

or

t1 = connect_to_table(CONN_INFO, "DEV.DEV_SCHEMA.TABLE", "ID")
t2 = connect_to_table(CONN_INFO, "PROD.PROD_SCHEMA.TABLE", "ID")
diff = diff_tables(t1, t2, algorithm=Algorithm.JOINDIFF)

[linear]

PX-279 Support same account "cross db" joindiff for Snowflake

[erezsh]

Looks good!