feat: backend.db_params

[NickCrews]

Originally posted by @mw3i in #5391 (comment):

Sorry for the late reply. Since ibis doesn't have upsert, our team uses the dataset library for inserts/updates/upserts. We do all our normal code in ibis, and then updates/upserts are done with:

import dataset

params = f"{dialect}://{user}:{password}@{url}:{port}/{database}" # <-- sqlalchemy database uri string
with dataset.connect(params) as dbx:
    dbx[tablename].upsert_many(
        list_of_dictionaries, # <-- each dict is a db entry
        column_to_use_as_identifier,
    )

Creating this URL is currently a bit difficult if you just have the backend connection. Could we make some dataclass like

class ConnectionParams:
    dialect: str
   ....

	def __str__(self): ...

and you could get access to it like backend.connection_params? This isn't a huge blocker, just a nice-to-have for the ux.