tests

Move encode and decode to concrete classes #1169

Job	Run time
package-source	28s
py-3.8 lib-6.1 ubuntu-latest	5m 10s
style	17s
py-3.8 lib-6.1 windows-latest	3m 27s
py-3.8 lib-6.0 ubuntu-latest	4m 49s
py-3.8 lib-6.0 windows-latest	2m 33s
py-3.8 lib-5.1 ubuntu-latest	4m 14s
py-3.8 lib-5.1 windows-latest	2m 46s
py-3.8 lib-5.0 ubuntu-latest	4m 2s
py-3.8 lib-5.0 windows-latest	3m 27s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 10s
py-3.8 lib-6.1 macos-latest	9m 22s
package-wheel (macos-latest, arm64)	15m 35s
package-wheel (macos-latest, x86_64)	28m 50s
package-wheel (ubuntu-latest, aarch64)	3h 25m 44s
package-wheel (ubuntu-latest, i686)	23m 34s
package-wheel (ubuntu-latest, x86_64)	20m 52s
package-wheel (windows-latest, AMD64)	16m 27s
publish	50s
	5h 56m 37s

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