fix: added mock for `useKeyboardContext`

📜 Description

Added mock for useKeyboardContext + AndroidSoftInputModes.

💡 Motivation and Context

useKeyboardContext and AndroidSoftInputModes is a part of official API of this library. However they are not exported from the library (so if you use them in unit-test -> this test will not pass and you will have to mock it manually).

So in this PR I'm adding them to mock and also adding a new unit test which assures that new mocks are actually present.

📢 Changelog

JS

added mock for useKeyboardContext;
added mock for AndroidSoftInputModes.

🤔 How Has This Been Tested?

Tested manually via newly added test.

📸 Screenshots (if appropriate):

📝 Checklist

[x] CI successfully passed
[x] I added new mocks and corresponding unit-tests if library API was changed

kirillzyusko / react-native-keyboard-controller

fix: added mock for `useKeyboardContext` #361