tests

Remove encode and decode for DataStream #1228

Job	Run time
py-3.9 lib-6.1 ubuntu-latest	5m 10s
package-source	21s
py-3.9 lib-6.0 ubuntu-latest	4m 22s
style	21s
py-3.9 lib-5.1 ubuntu-latest	4m 11s
py-3.9 lib-6.1 windows-latest	3m 24s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 25s
py-3.9 lib-6.0 windows-latest	3m 47s
py-3.9 lib-6.1 macos-latest	5m 17s
py-3.9 lib-5.1 windows-latest	3m 21s
package-wheel (macos-latest, arm64)	12m 59s
package-wheel (macos-latest, x86_64)	20m 34s
package-wheel (ubuntu-latest, aarch64)	2h 38m 6s
package-wheel (ubuntu-latest, i686)	17m 11s
package-wheel (ubuntu-latest, x86_64)	17m 0s
package-wheel (windows-latest, AMD64)	14m 34s
publish	54s
	4h 35m 57s

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