tests

Remove encode and decode for DataStream #1226

Job	Run time
py-3.9 lib-6.1 windows-latest	3m 16s
py-3.9 lib-6.0 windows-latest	2m 34s
style	17s
package-source	22s
py-3.9 lib-6.1 ubuntu-latest	5m 24s
py-3.9 lib-5.1 windows-latest	3m 26s
py-3.9 lib-6.0 ubuntu-latest	4m 8s
py-3.9 lib-5.1 ubuntu-latest	4m 12s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 41s
package-wheel (macos-latest, arm64)	11m 9s
py-3.9 lib-6.1 macos-latest	5m 30s
package-wheel (macos-latest, x86_64)	20m 56s
package-wheel (ubuntu-latest, aarch64)	2h 40m 32s
package-wheel (ubuntu-latest, i686)	17m 20s
package-wheel (ubuntu-latest, x86_64)	16m 42s
package-wheel (windows-latest, AMD64)	14m 3s
publish	54s
	4h 35m 26s

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