feat: Flatbuffer format #5873

Job	Run time
manylinux.amd64.py3.6.build	4m 15s
manylinux.amd64.py3.7.build	4m 14s
ubuntu-latest.amd64.py3.8.sdist-bundle	59s
manylinux.amd64.py3.8.build	4m 17s
manylinux.aarch64.py${{ matrix.config.version }}.build	0s
manylinux.amd64.py3.9.build	4m 6s
macos.amd64.py3.6.build	9m 21s
manylinux.amd64.py3.10.build	4m 5s
windows-2019.amd64.py3.6.build	14m 2s
macos.amd64.py3.7.build	8m 58s
windows-2019.amd64.py3.7.build	15m 55s
macos.amd64.py3.8.build	12m 20s
windows-2019.amd64.py3.8.build	16m 3s
macos.amd64.py3.9.build	12m 37s
windows-2019.amd64.py3.9.build	17m 18s
macos.amd64.py3.10.build	9m 28s
windows-2019.amd64.py3.10.build	17m 32s
manylinux.aarch64.py${{ matrix.config.version }}.test	0s
ubuntu-latest.amd64.py3.8.sdist-build-test	5m 1s
manylinux.amd64.py3.6.test	3m 27s
manylinux.amd64.py3.7.test	3m 22s
manylinux.amd64.py3.8.test	2m 43s
manylinux.amd64.py3.9.test	2m 32s
manylinux.amd64.py3.10.test	2m 24s
macos.amd64.py3.6.test	5m 34s
macos.amd64.py3.7.test	5m 6s
macos.amd64.py3.8.test	12m 37s
macos.amd64.py3.9.test	13m 20s
macos.amd64.py3.10.test	13m 1s
windows-2019.amd64.py3.6.test	13m 1s
windows-2019.amd64.py3.7.test	7m 2s
windows-2019.amd64.py3.8.test	7m 48s
windows-2019.amd64.py3.9.test	11m 50s
windows-2019.amd64.py3.10.test	7m 33s
	4h 31m 51s

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