feat(hero): 添加受击闪光效果并重构相关代码

新增FlashSprite组件实现受击闪光效果
重构HeroAnmComp和HeroViewComp以支持闪光效果
更新多个英雄prefab以包含闪光材质和组件

assets/script/game/hero/hit-flash-white/materials/hit-flash-white.mtl

@@ -0,0 +1,31 @@
+{
+  "__type__": "cc.Material",
+  "_name": "",
+  "_objFlags": 0,
+  "__editorExtras__": {},
+  "_native": "",
+  "_effectAsset": {
+    "__uuid__": "b8d82f81-c2f9-40e5-805b-922f0c170a79",
+    "__expectedType__": "cc.EffectAsset"
+  },
+  "_techIdx": 0,
+  "_defines": [
+    {
+      "USE_TEXTURE": true
+    }
+  ],
+  "_states": [
+    {
+      "rasterizerState": {},
+      "depthStencilState": {},
+      "blendState": {
+        "targets": [
+          {}
+        ]
+      }
+    }
+  ],
+  "_props": [
+    {}
+  ]
+}

assets/script/game/hero/hit-flash-white/materials/hit-flash-white.mtl.meta

@@ -0,0 +1,11 @@
+{
+  "ver": "1.0.21",
+  "importer": "material",
+  "imported": true,
+  "uuid": "8eee8ab1-fe48-4b22-b956-3f5c18fc4810",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {}
+}