feat(python/adbc_driver_manager): allow connect(profile="foo")

[lidavidm]

Closes #4077.

[ianmcook]

Tested and mostly works as expected. Thanks @lidavidm.

One small unexpected behavior: If I specify connect(driver="invalid", profile="foo"), and the connection profile foo specifies a valid driver, it succeeds. I would have expected that to fail.

[lidavidm]

One small unexpected behavior: If I specify connect(driver="invalid", profile="foo"), and the connection profile foo specifies a valid driver, it succeeds. I would have expected that to fail.

I think that's handled by the C++ driver manager itself, so I'll investigate that as a separate issue.