feat(core): add default Args to all types exposing Params

[chippers]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
allows using no generic parameters when the user is using Builder::default().

e.g. from

#[command]
fn window_label(window: Window<impl Params<Label = String>>) {
  println!("window label: {}", window.label());
}

to

#[command]
fn window_label(window: Window) {
  println!("window label: {}", window.label());
}

Marked as draft because it's late and I haven't tested it in the slightest. The command system extensively uses type inference, so we want to make sure that this doesn't break anything. It's not a breaking change to add this PR, so we are free to do so at any time in the future. Removing it after adding it would be a breaking change, so I want to be sure that it doesn't affect command inference first.