Further consolidate [CodeAsset] specific classes by moving them to lib/src/code_assets #947

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	5m 23s
build (ubuntu, stable, native_assets_cli, false)	1m 42s
build (ubuntu, stable, native_toolchain_c, false)	1m 54s
build (ubuntu, dev, native_assets_builder, false)	5m 12s
build (ubuntu, dev, native_assets_cli, false)	2m 20s
build (ubuntu, dev, native_toolchain_c, false)	2m 16s
build (macos, stable, native_assets_builder, false)	5m 36s
build (macos, stable, native_assets_cli, false)	1m 8s
build (macos, stable, native_toolchain_c, false)	1m 37s
build (macos, dev, native_assets_builder, false)	4m 1s
build (macos, dev, native_assets_cli, false)	1m 13s
build (macos, dev, native_toolchain_c, false)	1m 34s
build (windows, stable, native_assets_builder, false)	7m 53s
build (windows, stable, native_assets_cli, false)	2m 52s
build (windows, stable, native_toolchain_c, false)	4m 20s
build (windows, dev, native_assets_builder, false)	6m 59s
build (windows, dev, native_assets_cli, false)	3m 29s
build (windows, dev, native_toolchain_c, false)	3m 34s
coverage-finished	7s
	1h 3m 10s

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