feat: added signature pad component

[Swappea]

• New component added Signature pad
• This will allow to get users signature.
• It also has ability to generate image preview which can be used with image tag to show it to user.
• it can also be used with html5 forms.

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[jer3m01]

Will also delay the merge of this component as I'd need to find a way to make it accessible. Open to suggestions!

[Swappea]

Thanks for the PR!

Small bug with the image preview; it doesn't seem to fill the <img> fully: Also an option to change the color of the image would be useful.

I cannot seem to reproduce the bug, I can see complete image preview. Could you share which device were you using at that time? Look at the attached screenshot.

• As for color, yes I will find a way to send a props to override the default color.
• As for accessibility, I did searched for it, but I couldn't find much on it. I will continue to do so, if anyone else has any suggestions.