Refactor Image source provider

Skia use SKMemoryStream to read file mapping data
SKMemoryStream always use memcpy to emulate posix read stream behaviour, cannot take advantages of file mapping reading

* https://github.com/google/skia/blob/1f193df9b393d50da39570dab77a0bb5d28ec8ef/src/core/SkStream.cpp#L335

app/src/main/java/com/hippo/ehviewer/spider/SpiderQueen.java

@@ -855,7 +855,7 @@ public final class SpiderQueen implements Runnable {
                     continue;
                 }
 
-                Image.ByteBufferSource src = mSpiderDen.getImageSource(index);
+                Image.CloseableSource src = mSpiderDen.getImageSource(index);
                 if (src == null) {
                     resetDecodeIndex();
                     // Can't find the file, it might be removed from cache,