feat: delete_object and delete_objects #161

Job	Run time
Python Performance Tests / python-perf	15m 53s
Run Duvet / test	29s
Run TestServer Tests / test-server	14m 32s
Run Duvet / duvet	7m 3s
Python Integration Tests / python-integ	1m 22s
Lint / lint	16s
	39m 35s

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