Refactor adjustSpannableFontToFit to fix adjustsFontSizeToFit Text prop on Android

[hrastnik]

Summary:

The adjustSpannableFontToFit method had a miscalculation that caused incorrect font sizes to be applied to Text elements on Android when adjustsFontSizeToFit was set to true. Specifically, the applied font size incorrectly depended on the initial fontSize of the Text component rather than properly adjusting to fit the container.

In the screenshot below, the left side illustrates the issue. Three Text components display the same text:
"This line must be the same size as the other ones with the same text."
Each of these components has a fontSize value that would render the text larger than its container. With the adjustsFontSizeToFit prop enabled, the font size should adjust so the text fits within a single line.

However, due to the incorrect calculation, the font size depended on the initially applied fontSize, leading to inconsistent behavior.

The issue has been fixed, as shown on the right side of the screenshot. Now, the font size adjusts correctly to ensure the text fits the container, regardless of the initial fontSize.

In addition to resolving the issue, a binary search algorithm has been implemented to improve performance when determining the appropriate font size.

Changelog:

[ANDROID] [FIXED] - Fixed adjustsFontSizeToFit on Android sometimes applying wrong fontSize

Test Plan:

The screenshot above demonstrates the changes.