feat(alias): add `DownloadConcurrency` and `DownloadPartSize` option #193

Job	Run time
Build Binaries for Docker Release	15m 33s
Release Docker image (latest)	1m 10s
Release Docker image (ffmpeg)	1m 36s
Release Docker image (aria2)	1m 5s
Release Docker image (aio)	1m 48s
	21m 12s

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