[native_assets_cli] Add example for downloading assets #1096

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 34s
build (ubuntu, stable, native_assets_cli, false)	2m 12s
build (ubuntu, stable, native_toolchain_c, false)	2m 29s
build (ubuntu, dev, native_assets_builder, false)	5m 39s
build (ubuntu, dev, native_assets_cli, false)	2m 17s
build (ubuntu, dev, native_toolchain_c, false)	2m 11s
build (macos, stable, native_assets_builder, false)	5m 2s
build (macos, stable, native_assets_cli, false)	1m 2s
build (macos, stable, native_toolchain_c, false)	1m 32s
build (macos, dev, native_assets_builder, false)	4m 20s
build (macos, dev, native_assets_cli, false)	1m 14s
build (macos, dev, native_toolchain_c, false)	1m 34s
build (windows, stable, native_assets_builder, false)	7m 19s
build (windows, stable, native_assets_cli, false)	3m 2s
build (windows, stable, native_toolchain_c, false)	4m 41s
build (windows, dev, native_assets_builder, false)	8m 20s
build (windows, dev, native_assets_cli, false)	3m 53s
build (windows, dev, native_toolchain_c, false)	4m 23s
coverage-finished	2s
	1h 6m 46s

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