[Tzatziki Front] Create Gherkins Steps

[alexandrepa]

We want to propose generic gherkins steps that can be used to manipulate and assert on the browser so user don't have the need to create custom steps that manipulate directly the browser interface.

Tasks

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1. [Tzatziki Front] Browser manipulation (navigate and assert url) #258
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2. [Tzatziki Front] Perform an action in the browser #259
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3. [Tzatziki Front] Assert on browser elements #260
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