feat: add withAriaSupport option

[buschtoens]

As suggested in #915 (comment), this PR adds a withAriaSupport option, so that aria-* options are considered.

If not explicitly set, it defaults to false for all assertions, except for isChecked / isNotChecked, where it defaults to true. This way this is a non-breaking change.

• Implementation
  • isChecked / isNotChecked: aria-checked
  • isRequired / isNotRequired: aria-required
  • isDisabled / isNotDisabled / isEnabled: aria-disabled
  • isValid / isNotValid: aria-invalid
• Unresovled Questions:
  • Should isDisabled / isNotDisabled / isEnabled also (optionally?) consider:
    • aria-readonly
    • aria-busy
    • Should these (only?) be added as extra assertions, like: isReadonly, isBusy?
  • Should isVisible consider aria-hidden?
  • What about these attributes?
    • aria-expanded
    • aria-pressed
    • aria-selected
    • aria-valuenow
    • aria-valuetext
• Tests
• Docs

[Turbo87]

I think this is missing the fallback to this.options.withAriaSupport if the option is not explicitly specified in the passed in options argument

[Turbo87]

hmm, looks like you've moved that fallback into the functions. I think I'd prefer it if the functions would always get an options object with a withAriaSupport value and don't have to depend on this except for this.pushResult(). 🤔