Co-authored-by: Danilo Woznica <[email protected]>

BREAKING CHANGE: The `keyTimes`, `gradientTransform`, and `animateBegin` options have been removed.

…ilowoz#318)

If you're trying to import `react-content-loader/native` from Node 16.x
from within a ESM context (`"type": "module"`). You'll get the following
error:

```
node:internal/process/esm_loader:97
    internalBinding('errors').triggerUncaughtException(
                              ^

Error [ERR_UNSUPPORTED_DIR_IMPORT]: Directory import '~/node_modules/react-content-loader/native' is not supported resolving ES modules imported from /Users/swen/Code/cheetah/test/test.mjs
Did you mean to import react-content-loader/native/react-content-loader.native.cjs.js?
    at new NodeError (node:internal/errors:387:5)
    at finalizeResolution (node:internal/modules/esm/resolve:425:17)
    at moduleResolve (node:internal/modules/esm/resolve:1006:10)
    at defaultResolve (node:internal/modules/esm/resolve:1214:11)
    at nextResolve (node:internal/modules/esm/loader:165:28)
    at ESMLoader.resolve (node:internal/modules/esm/loader:844:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:431:18)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:76:40)
    at link (node:internal/modules/esm/module_job:75:36) {
  code: 'ERR_UNSUPPORTED_DIR_IMPORT',
  url: 'file:///~/node_modules/react-content-loader/native'
}
```

By setting up an explicit export for the `/native` subdirectory
the import works. No other changes are made to maintain backwards
compatibility.

danilowoz#319)

…er` in React Native environment (danilowoz#324)

* Update `IContentLoaderProps` in index.ts

Extended `IcontentLoaderProps` with props `backgroundOpacity` and `foregroundOpacity`.

* Update NativeSvg fore back/foregroundOpacity Svg.tsx

Added `backgroundOpacity` and `foregroundOpacity` freature for Native.

* Enabling `backgroundOpacity` and `foregroundOpacity` for `ContentLoader` on Native. in README.md

Updated docs to describe `backgourndOpacity` and `foregroundOpacity` props of `ContentLoader` available in React Native environment.

…der in RN