Add Number keyboard

[atabekm]

This issue covers adding a Number keyboard to new transactions screen:

You can refer to its previous implementation, which can be found at https://github.com/shagalalab/qarejet-android-old/tree/master/core-widgets/src/main/java/com/shagalalab/qarejet/core/widgets/numberkeyboard. Although, the previous implementation was using MVP, now you need to change it to MVI way. This will be your first "real" experience of working with USF.

Task

Add a Number keyboard to new transactions screen. Pay attention, this task covers only keyboard, but not the transaction amount TextView on top of it. It will have the following details:

• branch: feature/number-keyboard
• package location: com.shagalalab.feature.transaction.presentation.numberkeyboard
• classes to be added: NumberKeyboardView, NumberKeyboardViewModel, NumberKeyboardUsf, layout/view_number_keyboard.xml
• classes to be modified: Add NumberKeyboardView to NewTransactionFragment, keyboard interaction should be printed to console (print the transaction amount, for example, typing 1 will print 1, then 4 will 14, 9 will 149 and etc). This is temporary solution, it will be changed once we add transaction amount textview.

Acception criteria

• Layout needs to be implemented with ConstraintLayout
• Entering numbers will be reflected in console (for now)
• Pressing back button will remove the previous number (or dot if presents)
• Pressing dot should convert number to fractions
• Pressing down arrow expands the keyboard, and up button collapses. This needs to be done using animations.