static async readFixedBytes(stream, length, options = {}) {
        const bytes = await stream.read(length, { abortSignal: options.abortSignal });
        if (bytes.length !== length) {
            throw new Error("Hit stream end.");
        }
        return bytes;
    }
Reads a fixed number of bytes from the stream.

@param stream -
@param length -
@param options -