Add terms-of-service agreement parameter to the login command in the CLI if you are logging into the website

[cloutiertyler]

We determined a EULA for the CLI is unnecessary:

SpacetimeDB/crates/update/src/cli/self_install.rs

Line 35 in 0da26ce

eprintln!("Our EULA for spacetimedb-cli can be found here: <https://spacetimedb.com/eula>");

However, terms of service for the website + maincloud is eventually necessary. We should do a similar check upon login for the first time to the website through the CLI.