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Summary: This PR fixes https://github.com/facebook/react-native/issues/48657 - Memory usage for creating a blob lowered from _( nearest 2^N greater than the file size)+1KB_ previously To _(file size)+1KB_. This is achieved by avoiding internal calls to java.io.ByteArrayOutputStream.ensureCapacity by creating a buffer based on file size. - Increases the max file size a Blob can be created from before hitting a OutOfMemoryException. - Major performance increase by avoiding buffer copying ## Changelog: [ANDROID] [CHANGED] - Speed and Memory usage improvements to Android Blob support [ANDROID] [FIXED] - Creating of Blobs from large files now works. File size can now be upto available (free) heap size. Pull Request resolved: https://github.com/facebook/react-native/pull/50121 Test Plan: Used the App here to test Android Blob creation. https://github.com/giantslogik/blob-large-file-fetch. Reviewed By: cortinico Differential Revision: D71464835 Pulled By: javache fbshipit-source-id: 38de7d83bcaee265fc6e7183f6b1160027cd4cb2