Add `attributes` on `StepOptionsButton`

[loriepisicchio]

Hello !
I would like to be able to add a data-testid attribute on the generated buttons for the tour, in order to ease the E2E tests of my application.
My code would look like

        const steps: Step.StepOptions[] = [
            {
                id: TourService.STEP_0_WELCOME,
                text: `<h1>Welcome !</h1>
                        <div>Let us take you on a quick tour.</div>`,
                buttons: [
                    {
                        classes: 'tour-button-secondary',
                        text: 'Skip tutorial',
                        attributes: {'data-testid', 'tutorial-button-skip'},
                        action: skip,
                    },
                    {
                        classes: 'tour-button-primary',
                        text: 'Next',
                        attributes: {'data-testid', 'tutorial-button-next'},
                        action: next,
                    },
                ],
            },
         }

Do you think this is a feature you could add ?

[RobbieTheWagner]

Hi @loriepisicchio, this seems like a good addition! I think this is something we would want to add in Shepherd itself. Would you be interested in submitting a PR for this?

[avramz]

@rwwagner90 This one still up for grabs?

[RobbieTheWagner]

@avramz yeah, but it would need to be done in Shepherd itself.