feat: implemented kafka multiplayer peer. #9

Job	Run time
build (linux, single, x86_64, template_debug, ubuntu-20.04)	7m 49s
build (windows, single, x86_32, template_debug, windows-latest)	11m 44s
build (windows, single, x86_64, template_debug, windows-latest)	10m 15s
build (macos, single, universal, template_debug, macos-latest)	6m 42s
build (android, single, arm64, template_debug, ubuntu-20.04)	7m 38s
build (android, single, arm32, template_debug, ubuntu-20.04)	6m 9s
build (android, single, x86_64, template_debug, ubuntu-20.04)	7m 26s
build (android, single, x86_32, template_debug, ubuntu-20.04)	6m 16s
build (ios, single, arm64, template_debug, macos-latest)	3m 56s
build (web, single, wasm32, template_debug, ubuntu-20.04)	14m 14s
build (linux, single, x86_64, template_release, ubuntu-20.04)	7m 52s
build (linux, double, x86_64, template_debug, ubuntu-20.04)	8m 0s
build (windows, double, x86_32, template_debug, windows-latest)	9m 29s
build (windows, double, x86_64, template_debug, windows-latest)	8m 57s
build (macos, double, universal, template_debug, macos-latest)	6m 30s
build (android, double, arm64, template_debug, ubuntu-20.04)	6m 22s
build (android, double, arm32, template_debug, ubuntu-20.04)	6m 17s
build (android, double, x86_64, template_debug, ubuntu-20.04)	6m 14s
build (android, double, x86_32, template_debug, ubuntu-20.04)	6m 22s
build (ios, double, arm64, template_debug, macos-latest)	4m 58s
build (web, double, wasm32, template_debug, ubuntu-20.04)	14m 25s
build (linux, double, x86_64, template_release, ubuntu-20.04)	7m 52s
merge	3s
	2h 55m 30s

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