refactor: parse host, port, and scheme from base_url for credentials

[0xN1nja]

Simplify credential configuration by accepting a single base_url parameter instead of setting up host, port, and scheme manually by the constructor functions with_port and with_scheme.

Parsing base_url by gleam/uri to get host, port, and scheme:

pub fn credentials(
  base_url: String,
  access_key_id: String,
  secret_access_key: String,
) -> Credentials {
  let assert Ok(parsed_url) = uri.parse(base_url)

  Credentials(
    host: parsed_url.host,
    port: parsed_url.port,
    scheme: parsed_url.scheme,
    region: "eu-west-1",
    access_key_id:,
    secret_access_key:,
    session_token: option.None,
  )
}

User can now specify a base_url in bucket.credentials, and gleam/uri would automatically parse the URI in the background.

let creds = bucket.credentials(
  base_url: "https://s3-api-host.example.com:port",
  access_key_id: "YOUR_ACCESS_KEY",
  secret_access_key: "YOUR_SECRET_ACCESS_KEY",
)

[lpil]

This has replaced type safety for runtime exceptions, and it introduces a breaking change, neither of which we want.

Please do not open a PR for unplanned changes, instead make an issue first 🙏

[lpil]

🔴 Libraries must never panic!