python: use KV1Writer for Python KV1 bindings to fix lifetime issues #834

Job	Run time
build (Debug, ubuntu-latest)	3m 29s
build (Debug, macos-latest)	3m 0s
build (Release, macos-latest)	2m 59s
build (Release, windows-latest)	7m 30s
build (Release, ubuntu-latest)	4m 35s
build (Debug, windows-latest)	6m 36s
	28m 9s

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