[Onboarding] Create OnboardLayout component

[CassioMG]

This task is intended to create a base OnboardLayout component which should be reused in all Onboarding screens.

We can check on Figma designs (image below) that all Onboarding screens have the below consistent similarities:

• Background color (fixed)
• Screen padding (fixed)
• Avatar on top left corner with custom icon
• Display title with custom copy
• Continue/Submit button with custom title
• (optional) Footnote custom copy
• (optional) Back/Cancel button

The OnboardLayout component interface should comply to those UI properties. It should also implement the KeyboardAvoidingView (or some other applicable solution) so that the content reacts accordingly when the keyboard shows up.

Suggested interface:

<OnboardLayout
     icon={<Icon.PasscodeLock />}
     title="Choose a Password"
     submitButtonTitle="Continue"
     onSubmit={goToNextScreen}
     footnote="We cannot recover your password for you. Make sure you keep this in a safe place."
     cancelButtonTitle="Go back"
     onCancel={goToPreviousScreen}
>
     {children}
<OnboardLayout />