[native_assets_cli] Add example for downloading assets #1097

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 1s
build (ubuntu, stable, native_assets_cli, false)	1m 57s
build (ubuntu, stable, native_toolchain_c, false)	2m 3s
build (ubuntu, dev, native_assets_builder, false)	5m 36s
build (ubuntu, dev, native_assets_cli, false)	3m 16s
build (ubuntu, dev, native_toolchain_c, false)	2m 2s
build (macos, stable, native_assets_builder, false)	5m 49s
build (macos, stable, native_assets_cli, false)	1m 15s
build (macos, stable, native_toolchain_c, false)	1m 40s
build (macos, dev, native_assets_builder, false)	4m 28s
build (macos, dev, native_assets_cli, false)	1m 18s
build (macos, dev, native_toolchain_c, false)	1m 50s
build (windows, stable, native_assets_builder, false)	7m 58s
build (windows, stable, native_assets_cli, false)	3m 16s
build (windows, stable, native_toolchain_c, false)	4m 16s
build (windows, dev, native_assets_builder, false)	8m 27s
build (windows, dev, native_assets_cli, false)	3m 17s
build (windows, dev, native_toolchain_c, false)	4m 25s
coverage-finished	3s
	1h 7m 57s

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