Add support for FS.open, FS.close, FS.read, FS.write,

[animeshxd]

Added read and write methods for handling large file
Here is the example

async function download(url, path) {
    let fd;
    try {
        fd = await ffmpeg.open(path, 'w')
        const resp = await fetch(url);
        const reader = resp.body.getReader();
        while (true) {
            const { done, value } = await reader.read();
            if (done) break;
            await ffmpeg.write(fd, value, 0, value.length)
        }
    }
    finally {
        await ffmpeg.close(fd)
    }
}

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[animeshxd]

open and close name is kinna weird 😫, openFile, closeFile would be better or maybe FS namespace