fix: add correct invalidate calls to SvgView on ios with test (#2327)

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# Summary
This is a sibling PR to:
https://github.com/software-mansion/react-native-svg/pull/2318 which
fixed missing mount/unmount methods to correctly display SVG.

This PR overrides the same `mountChildComponentView` and
`unmountChildComponentView` methods but for `RNSVGSvgView` component.
This will make the components and their behaviour aligned and more
predictable.

I included the test that specifically tests for attaching another
external svg into and already existing SVG, should catch any edge cases
with invalidation/redrawing.

## Test Plan
`TestExample` app -> `TestSvgUriUpdating` example.


https://github.com/software-mansion/react-native-svg/assets/3929868/49499914-7037-4ab0-a9a9-1e139d460117


## Compatibility

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

## Checklist

<!-- Check completed item, when applicable, via: [X] -->

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

apple/Elements/RNSVGSvgView.mm

@@ -116,6 +116,19 @@ using namespace facebook::react;
   _invviewBoxTransform = CGAffineTransformIdentity;
   rendered = NO;
 }
+
+- (void)mountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
+{
+  [super mountChildComponentView:childComponentView index:index];
+  [self invalidate];
+}
+
+- (void)unmountChildComponentView:(UIView<RCTComponentViewProtocol> *)childComponentView index:(NSInteger)index
+{
+  [super unmountChildComponentView:childComponentView index:index];
+  [self invalidate];
+}
+
 #endif // RCT_NEW_ARCH_ENABLED
 
 - (void)insertReactSubview:(RNSVGView *)subview atIndex:(NSInteger)atIndex