feat: animate ion-footer on keyboard open & close about ionic-framework HOT 2 OPEN

Hello @drakedeatonuk thanks for this feature request!

I can see you have also experienced the pain that is trying to animate any content relative to the keyboard position! Based on the current state of technology, this is difficult for anyone to do perfectly in all environments. Devices are notoriously inconsistent with the rendered keyboard height.

We have to use a mixed strategy of starting an animation when the keyboard show event is dispatched and doing a best guess to the animation duration & curve when animating to a fixed position relative to the keyboard height. Almost every implementation I've seen that has tried this either animates their custom content a little off from the keyboard or they wait until the keyboard has fully appeared before revealing an accessory bar.

I will discuss with the team and see if we have opinions on how to best handle this. Due to the limitation of how well we can also do this out of the box, potentially documentation and/or a blog may be better suited so developers can customize the implementation to match their device demographics best.

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@sean-perkins I feel like there should be a support group from people who've gone down the custom mobile keyboard content animate rabbit hole!

A blog or a page of documentation on best practices/ different approaches would be very valuable I think. I know long I spent looking for resources and not quite ever finding the help I wanted.

Perhaps some examples of approaches to try could be included too. Recently I've been toying with animating a transform: translateY on a keyboardWillShow event with the keyboardResize mode set to Native - that's been quite a smooth looking transition although there's still some edge cases I need to work out.

There are truly some serious "gotchyas" when it comes to keyboard events too. For example, when a keyboard with auto-fill suggestions at it's top opens, ios actually sends two onWillShow and onDidShow events. This in particular created some headaches for creating animations as it makes it much harder to figure out if keyboard events were, from the users perspective, related to a keyboard appearing, or changing height.

Recently I've been gathering some measurements from ever ios devices as it seems that keyboard heights are always consistently off by a certain amount:

Can I ask, have you guys ever had any luck with this type of approach?

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