Allow children dictate height

[daniel112]

Remake of this PR: #1237

Please provide enough information so that others can review your pull request:

Motivation
A follow-up to this comment: #1198 (comment)

There exists some use case where we want to embed this tab view within a view (typically a scroll view), doing so does not properly set the height UNLESS you specifically give TabView a static height.
In some cases, our content needs to be dynamic so setting a specific height prior to rendering the content will not look great.

This PR covers the edge case where:

• you want to embed a tabview that's not full screen and/or is within another view
• your content is dynamic is height

Test plan

• I've added an example to the /example folder to better visualize this, but I also have been using this modified version in my production application

Before changes

before.mp4

After changes

after.mp4

dynamic.mp4

[daniel112]

@okwasniewski
I'm not able to get it working anymore after the dependencies upgrade.
could be the react-native-pager-view upgrade or expo.

not 100% sure

[okwasniewski]

Hey @daniel112, sorry for misunderstanding I'm afraid this won't work with the current pager-view version. I'm closing this one for now.

[gabrielfurini]

@daniel112 It seems a recent update in the react-native-pager-view caused this. There is a mention here: #1274 (comment)