feat: add FeMerge and FeMergeNode filters (#2369)

# Summary

As mentioned in #2362
Introduce new filters:
* `FeMerge`
* `FeMergeNode`

## Example usage

```tsx
<Svg width="200" height="200">
  <Filter id="mergeWithOffset" width="180" height="180">
    <FeOffset dx="50" dy="50" result="test" />
    <FeOffset dx="100" dy="100" in="SourceGraphic" />
    <FeMerge>
      <FeMergeNode in="SourceGraphic" />
      <FeMergeNode in="test" />
      <FeMergeNode />
    </FeMerge>
  </Filter>
  <Rect
    x="0"
    y="0"
    width="100"
    height="100"
    stroke="black"
    fill="red"
    filter="url(#mergeWithOffset)"
  />
</Svg>
```

<img width="207" alt="image"
src="https://github.com/user-attachments/assets/9cb3ded6-f939-4b2b-8ece-df54e64fe898">

## Test Plan

`Example` app -> `Filters` -> `FeMerge`

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ✅     |
| Android |    ✅     |

## Checklist

- [x] I have tested this on a device and a simulator
- [x] I added documentation in `README.md`
- [x] I updated the typed files (typescript)

apps/examples/src/examples/Filters/FeMerge.tsx

@@ -0,0 +1,92 @@
+import React, {Component} from 'react';
+import {
+  Svg,
+  Circle,
+  FeColorMatrix,
+  Filter,
+  G,
+  FeMerge,
+  FeMergeNode,
+  Rect,
+  FeOffset,
+} from 'react-native-svg';
+
+class WithOffsetsExample extends Component {
+  static title = 'Merge with SourceGraphic and offsets';
+  render() {
+    return (
+      <Svg width="200" height="200">
+        <Filter id="mergeWithOffset" width="180" height="180">
+          <FeOffset dx="50" dy="50" result="test" />
+          <FeOffset dx="100" dy="100" in="SourceGraphic" />
+          <FeMerge>
+            <FeMergeNode in="SourceGraphic" />
+            <FeMergeNode in="test" />
+            <FeMergeNode />
+          </FeMerge>
+        </Filter>
+        <Rect
+          x="0"
+          y="0"
+          width="100"
+          height="100"
+          stroke="black"
+          fill="red"
+          filter="url(#mergeWithOffset)"
+        />
+      </Svg>
+    );
+  }
+}
+
+class WithHueRotateExample extends Component {
+  static title = 'Merge with SourceGraphic and HueRotate';
+  render() {
+    return (
+      <Svg width="150" height="150">
+        <Filter id="mergeWithHue" width="180" height="180">
+          <FeOffset dx="50" dy="50" />
+          <FeColorMatrix type="hueRotate" values="240" />
+          <FeMerge>
+            <FeMergeNode />
+            <FeMergeNode in="SourceGraphic" />
+          </FeMerge>
+        </Filter>
+        <Rect
+          x="0"
+          y="0"
+          width="100"
+          height="100"
+          stroke="black"
+          fill="red"
+          filter="url(#mergeWithHue)"
+        />
+      </Svg>
+    );
+  }
+}
+
+const icon = (
+  <Svg height="30" width="30" viewBox="0 0 20 20">
+    <Filter id="mergeWithOffsetIcon" width="180" height="180">
+      <FeOffset dx="5" dy="5" />
+      <FeMerge>
+        <FeMergeNode />
+        <FeMergeNode in="SourceGraphic" />
+      </FeMerge>
+    </Filter>
+    <Rect
+      x="1"
+      y="1"
+      width="13"
+      height="13"
+      fill="blue"
+      filter="url(#mergeWithOffsetIcon)"
+      strokeWidth="1"
+      stroke="black"
+    />
+  </Svg>
+);
+
+const samples = [WithOffsetsExample, WithHueRotateExample];
+export {icon, samples};

apps/examples/src/examples/Filters/examples.tsx

@@ -1,5 +1,12 @@
 import * as FeColorMatrix from './FeColorMatrix';
 import * as FeGaussianBlur from './FeGaussianBlur';
+import * as FeMerge from './FeMerge';
 import * as FeOffset from './FeOffset';
 import * as ReanimatedFeColorMatrix from './ReanimatedFeColorMatrix';
-export {FeColorMatrix, FeGaussianBlur, FeOffset, ReanimatedFeColorMatrix};
+export {
+  FeColorMatrix,
+  FeGaussianBlur,
+  FeMerge,
+  FeOffset,
+  ReanimatedFeColorMatrix,
+};