Feature Proposal: Builder for Constructing New URL Instances from Parts

I work with databases; a use case I often have isn't parsing a URL, but rather constructing one from pieces -- provide my own host or IP address, set a scheme, add query params one at a time or many at once, etc etc. The current API starts from an assumption of parsing an existing URL from a string, then modifying it. I'd like to propose a wrapper for constructing a new URL.

Personally, I quite like a builder for this kind of thing. I'm imagining something a little like:

let maybe_url = UrlBuilder::new()
                    .with_scheme("postgresql")
                    .with_host("10.40.0.9")
                    .with_port(5432)
                    .with_subresource("application_db")
                    .build();

match maybe_url {
  Ok(url) => printlin!("Got: {}", url),                                     // -> Got: postgresql://10.40.0.9:5432/application_db
  Err(e) => eprintln!("Url construction failed: {}", e),   
}

Convenience methods for common patterns can be provided: with_https, for instance; an API like with_http_defaults could pre-set scheme and port.

I'm happy to contribute this if it sounds like a feature y'all would like to have!

No files, tests, or entry points are named in the issue. Start by reviewing the existing URL parsing and modification API, then clarify the builder's supported parts, validation behavior, and convenience methods with maintainers; done should mean an agreed scope and corresponding coverage for constructing URLs from parts.