feat: add Accelerator::key and Accelerator::modifiers getters

[stijnfrishert]

This is a PR to expose the Modifiers and Code fields within an Accelerator, immutably. The types are public anyway, so I don't see why you shouldn't be able to inspect what you set earlier.

I personally need this to extract the modifiers and code and fill a human readable struct with them like so. I'm only using the Accelerator type from muda because it nicely represents hotkeys and supports string parsing.

struct Hotkey {
  shift: bool,
  alt: bool,
  control: bool,
  super: bool,
  key: Code,
}

[amrbashir]

Could you also add a change file in .changes directory?

[stijnfrishert]

Amended my commit and pushed the new changes, including a file in .changes, @amrbashir 👍

[amrbashir]

Thank you