Summary:
This PR fixes the drawing of the border rounded edges when the border-radius is small than the border-width. The current implementation capped the possible border-radius making it impossible to set smaller border-radii when using thicker borders. After inspection it was found that the rounded-rect calculation is incorrect.
## Changelog
`[Android] [Fixed] - Fix rounded border-drawing when border-radius is smaller than border-width`
Pull Request resolved: https://github.com/facebook/react-native/pull/28358
Test Plan:
**Faulty situation:**
As you can see, when the border-radius becomes very low, the border is stuck at a minimum value. Only after setting the border-radius fully to 0 is it again rendered correctly.

**After the fix:**

Differential Revision: D21124739
Pulled By: shergin
fbshipit-source-id: cefd1776b77b5b9fb335e95fd7fdd7f345579dc4
Summary:
This gets us on the latest Prettier 2.x:
https://prettier.io/blog/2020/03/21/2.0.0.html
Notably, this adds support for TypeScript 3.8,
which introduces new syntax, such as `import type`.
Reviewed By: zertosh
Differential Revision: D20636268
fbshipit-source-id: fca5833d003804333a05ba16325bbbe0e06d6c8a
Summary:
Changes RNTester, first attempt in the direction of improving the RNTester overall. Related ticket: #24647
Changed the `js` directory of the RNTester to have the following structure:
```
- js
- assets
- components
- examples
- types
- utils
```
* **assets**
_Any images, gifs, and media content_
* **components**
_All shared components_
* **examples**
_Example View/Components to be rendered by the App_
* **types**
_Shared flow types_
* **utils**
_Shared utilities_
## Changelog
[General] [Changed] - Update folder structure of RNTester's JS directory.
Pull Request resolved: https://github.com/facebook/react-native/pull/25013
Differential Revision: D15515773
Pulled By: cpojer
fbshipit-source-id: 0e4b6386127f338dca0ffe8c237073be53a9e221