feat: FeFlood (#2487)

# Summary

Continuation of #2362 implementing `FeFlood` filter
https://www.w3.org/TR/SVG11/filters.html#feFloodElement

## Test Plan

Example app → Filters → `FeFlood`

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ✅      |
| macOS   |    ✅ _*_      |
| Android |    ✅      |
| Web     |    ✅      |

_* `canvasWidth/canvasHeight` is incorrect on macOS, so there might be
some problems_

apple/ViewManagers/RNSVGFeFloodManager.h

@@ -0,0 +1,5 @@
+#import "RNSVGFilterPrimitiveManager.h"
+
+@interface RNSVGFeFloodManager : RNSVGFilterPrimitiveManager
+
+@end

apple/ViewManagers/RNSVGFeFloodManager.mm

@@ -0,0 +1,16 @@
+#import "RNSVGFeFloodManager.h"
+#import "RNSVGFeFlood.h"
+
+@implementation RNSVGFeFloodManager
+
+RCT_EXPORT_MODULE()
+
+- (RNSVGFeFlood *)node
+{
+  return [RNSVGFeFlood new];
+}
+
+RCT_EXPORT_VIEW_PROPERTY(floodColor, RNSVGBrush)
+RCT_EXPORT_VIEW_PROPERTY(floodOpacity, CGFloat)
+
+@end