Added Tooltip component and stories

[alfetopito]

Description

New Tooltip component following the new design.

Notes:

Could not make the props load on the storybook for this component. What am I missing?

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[ghost]

Travis automatic deployment:
https://pr61--safereactcomponents.review.gnosisdev.com

[nicosampler]

could you use makeStyles instead?
Heres an example https://github.com/gnosis/safe-react/blob/development/src/components/App/index.tsx#L60.

[nicosampler]

Could not make the props load on the storybook for this component. What am I missing?

I had this problem before, don't remember what was the problem I'll take a look later.

[nicosampler]

Styles should be the same as the one used on the Icon and Text component.

Also, would be good if the current tooltips are replaced by this new component.

[nicosampler]

Thx for this PR, it was implemented in #92.