[RNMobile] Support percentage in columns

[lukewalczak]

Fixes / first iteration of: wordpress-mobile/gutenberg-mobile#2197

Description

That PR introduces the first iteration of the column percentage mechanism. It includes:

• controller to change column width available in column settings and the preview next to the slider:

• columns layout picker:

How has this been tested?

1. Open mobile app
2. Add Columns block
   3. Expect to see bottom sheet with layout picker
3. Choose one of the options e.g: 33/33/33
4. Select the first column
5. Open its settings
6. Change the value e.g. to 90
   8. Expect that fill level in the preview (to the left of a slider) increased
7. Close bottom sheet and select the second column
8. Open its settings
9. Press text input (to the right of a slider)
10. Type value with more than 1 decimal e.g: 55.555555 and press Done
    13. Expect to have value with 1 decimal
11. Close bottom sheet and switch to HTML mode
    15. Expect that first column has width equal 90 and the second 55.5
12. Save the post and open it on web
    17. Expect to see columns displayed proportionally to set the width values

Screenshots

Types of changes

New feature/functionality - columns percentage

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: 0 B

Total Size: 1.15 MB

ℹ️ View Unchanged

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_{compressed-size-action}

[lukewalczak]

UPDATES

• Changed Cancel button color
• Limit the slider adjustments to whole numbers (while still allowing decimals in the text input)

light	dark

[lukewalczak]

UPDATES

• Rename label from Column percentage to Width